AlphaMidiCourse Sales Guide
The aim of this document is to provide an easy guide to the AlphaMidiCourse, covering basic
configurations, scope of supply, main features, options, alternative configurations and the rules and
regulations behind the products.
With this introduction it is our goal to minimize questions and help you in order to provide your
customer with the proper information. We advise you to study this document carefully before raising a
question. Most probably an answer is already in AlphaMidiCourse Sales Guide - version 1.04. When
we receive an question that not can be found in AlphaMidiCourse Sales Guide - version 1.04 but is of
common interest, we try to add this information into the next release.
Please note that this AlphaMidiCourse Sales Guide - version 1.04 is not a technical manual. If more
technical information is required, please request a technical/ installation manual for this product or
consult one of our technical engineers.
The reader should understand that this document describes the most important matters but will
constantly be improved. Therefore we herewith ask your valuable feedback from you and your
colleagues in order to cover our combined knowledge that can be supplied together with our products
to become successful, gain good sales and happy customers.
This Sales guideline document is intended for the Alphatron organization and dealers and therefore
shall not be transferred in whole outside an Alphatron or dealer company.
Extract of text and pictures can be copied and used for preparation of any sales document.
Your feedback and suggestions for improvements are appreciated so please do not hesitate to contact
Alphatron Marine International (AMI) team, [email protected]
2
INTRODUCTION ..................................................................................................................................2
TABLE OF CONTENTS ........................................................................................................................3
QUICK SUMMARY ...............................................................................................................................4
PURPOSE OF THE SYSTEM ..........................................................................................................4
OPERATIONAL FEATURES ................................................................................................................5
Data...................................................................................................................................................5
Gyro Element ....................................................................................................................................5
Sensor ...............................................................................................................................................5
Features ............................................................................................................................................5
BASICS ................................................................................................................................................6
GYROCOMPASS OPERATION .......................................................................................................7
USING THE GYROCOMPASS.........................................................................................................7
GYROCOMPASS ERRORS .............................................................................................................8
MAIN SYSTEM COMPONENTS ...........................................................................................................9
MAIN UNIT .......................................................................................................................................9
CONTROL UNIT ..............................................................................................................................9
PERFORMANCE & SPECIFICATIONS MAIN COMPONENTS...................................................... 10
ACCESSORIES .................................................................................................................................. 11
REPEATER COMPASS ................................................................................................................. 11
REPEATER HOLDER .................................................................................................................... 11
REPEATER STAND ....................................................................................................................... 11
AZIMUTH CIRCLE ......................................................................................................................... 11
ANNUNCIATOR ............................................................................................................................. 12
NMEA DISTRIBUTION INTERFACE .............................................................................................. 12
ALPHALINE REPEATER DISPLAYS MF ....................................................................................... 13
CONNECTIONS ................................................................................................................................. 14
CABLE DIAGRAM .......................................................................................................................... 15
CONNECTION DIAGRAM.............................................................................................................. 16
MECHANICAL SPECIFICATIONS ...................................................................................................... 17
WHAT IS REQUIRED ON BOARD ..................................................................................................... 18
SOLAS REQUIREMENTS.............................................................................................................. 18
CLASS REQUIREMENTS .............................................................................................................. 18
MARKETING ...................................................................................................................................... 20
UNIQUE SELLING POINTS ........................................................................................................... 20
COMPETITORS ............................................................................................................................. 20
TARGET MARKET ......................................................................................................................... 20
LIMITATIONS................................................................................................................................. 20
CERTIFICATE .................................................................................................................................... 21
WHEELMARK ................................................................................................................................ 21
STANDARD CERTIFICATE ........................................................................................................... 22
AlphaMidiCourse Module B Certificate ...........................................................................................22
AlphaMidiCourse Module D Certificate ...........................................................................................23
ORDERING ........................................................................................................................................ 24
3
The AlphaMidiCourse
is highly reliable, has
an enhanced followup performance and
several interfacing
features to connect to
external equipment.
The Gyro compass AlphaMidiCourse complies with requirements of IMO
A.424(XI), ISO 8728 and AlphaMidiCourse HS complies to A.821 (19), ISO
16328 HSC. Both versions are Marine Equipment Directive 96/98/ЕС or
Wheelmark approved.
A gyrocompass is a type of non-magnetic compass which is based on a fast-spinning disc and rotation
of the Earth to automatically find geographical direction, true north. The AlphaMidiCourse exploits this
property and uses earth gravitational attraction and rotation to align the gyroscope spin axis with the
meridian, i.e. in the true north direction.
The AlphaMidiCourse is designed to meet the needs of the marine market Highly accurate
performance derived from the aerospace industry, combined with a ruggedized construction in order to
cope with the most severe circumstances at sea.
4
The AlphaMidiCourse provides the following data:
 Heading against the geographical meridian at the vessel speed up to 50 knots and 70 knots for
the AlphaMidiCourse HS
 Latitude up to 70 degrees
 Roll and pitch angles up to maximum ± 45 degrees
 Information on operation mode and failure indication
The high precision dynamically tuned gyroscope and gimbal suspension. Derived from aerospace
technology, now available to the marine industry.
 Unique new technology sensitive elements requires no annual servicing
 No oil change
 Quick installation
 Very low RPM reduces wear, increasing life time
The heart of the gyrocompass is a dynamically-tuned gyroscope - a very accurate sensor that ensures
a follow-up speed >75°/s.










Small size and versatility, small Gyro compass with a control unit
Automatic speed error correction
Short initial settling time (within 3 hours)
High reliability
High static and dynamic accuracy (latitude and speed compensation, automatic compensation
of temperature drifts)
Easy installation and adjustment, built-in testing
No compass fluid, extra cooling and heating are required, no periodic determination and
compensation of azimuth drift, simplified methods of horizontal drift determination and
compensation
Type approval: Wheel mark IMO:A424 (XI), A694 (17). IEC: 60945, 61162. ISO: 8728 (1997)
Operating temperature from -10°C to +50°C
Storage temperature from -25°C to +70°C
5
A gyroscope consists of a spinning wheel or rotor contained within gimbals which permit movement
about three mutually perpendicular axes, known as the horizontal axis, the vertical axis, and the
spin axis. When spun rapidly, assuming that friction is not considered, the gyroscope develops
gyroscopic inertia, tending to remain spinning in the same plane indefinitely. The amount of gyroscopic
inertia depends on the angular velocity, mass, and radius of the wheel or rotor.
Rigidity in space refers to the principle that a wheel with a heavily weighted rim spun rapidly will
remain in a fixed position in the plane in which it is spinning. By mounting this wheel, or gyroscope, on
a set of gimbal rings, the gyro is able to rotate freely in any direction. Thus, if the gimbal rings are
tilted, twisted, or otherwise moved, the gyro remains in the plane in which it was originally spinning.
When a force is applied to change alignment of the
spin axis of a gyroscope, the resultant motion is
perpendicular to the direction of the force. This
tendency is known as precession. A force applied to
the center of gravity of the gyroscope will move the
entire system in the direction of the force. Only a
force that tends to change the axis of rotation
produces precession.
If a gyroscope is placed at the equator with its spin
axis pointing east-west, as the earth turns on its axis,
gyroscopic inertia will tend to keep the plane of
rotation constant. To the observer, it is the gyroscope
which is seen to rotate, not the earth. This effect is
called the horizontal earth rate, and is maximum at
the equator and zero at the poles. At points between,
it is equal to the cosine of the latitude.
Gyro spinning at equator with its axis horizontal.
If the gyro is placed at a geographic pole with its spin axis horizontal, it will appear to rotate about
its vertical axis. This is the vertical earth rate. At all points between the equator and the poles, the
gyro appears to turn partly about its horizontal and partly about its vertical axis, being affected by
both horizontal and vertical earth rates. In order to visualize these effects, remember that the gyro
at whatever latitude it is placed, is remaining aligned in space while the earth moves beneath it.
At high latitudes, the only true resting position for a gyro with complete
freedom is that in which the gyro is set spinning with its axis parallel to
the earth's polar axis. For latitude 50° North, the gyro, spinning in its
true resting position, would be tilted so that the gyro axle would make
an angle with the horizontal equal to the angle of latitude as shown in
figure on right, with the gyro axle in the meridian and the north end of
the gyro axle pointing upward.
However, there are reasons for this tilt being impracticable with
respect to gyrocompasses. A gyrocompass must have the gyro axle
nearly horizontal. Means must therefore be applied to secure a resting
position in the meridian and in the horizontal. Accordingly the axle of
the gyrocompass is parallel to the polar axis of the earth only when the
compass is operating at the equator.
6
To make a gyroscope into a gyrocompass, the wheel or rotor is mounted in a sphere, called the gyro
sphere, and the sphere is then supported in a vertical ring. The whole is mounted on a base called the
phantom. The gyroscope in a gyrocompass can be pendulous or non-pendulous, according to design.
The rotor may weigh as little as half a kilogram to over 25 kg. To make it seek and maintain true north,
three things are necessary:
 First, the gyro must be made to stay on the plane of the meridian.
 Second, it must be made to remain horizontal.
 Third, it must stay in this position once it reaches it regardless of what the vessel on which it is
mounted does or where it goes on the earth.
To make it seek the meridian, a weight is added to the bottom of the vertical ring, causing it to swing
on its vertical axis, and thus seek to align itself horizontally. It will tend to oscillate, so a second weight
is added to the side of the sphere in which the rotor is contained, which dampens the oscillations until
the gyro stays on the meridian. With these two weights, the only possible position of equilibrium is on
the meridian with its spin axis horizontal. To make the gyro seek north, a system of reservoirs filled
with mercury, known as mercury ballistics, is used to apply a force against the spin axis.
The ballistics, usually four in number, are placed so that their centers of gravity exactly coincide with
the center of gravity of the gyroscope. Precession then causes the spin axis to trace an ellipse, one
ellipse taking about 84 minutes to complete. (This is the period of oscillation of a pendulum with an
arm equal to the radius of the earth.) To dampen this oscillation, the force is applied, not in the vertical
plane, but slightly to the east of the vertical plane. This causes the spin axis to trace a spiral instead of
an ellipse and eventually settle on the meridian pointing north.
Since a gyrocompass is not influenced by magnetism, it is not subject to variation or deviation. Any
error is constant and equal around the horizon, and can often be reduced to less than one degree,
thus effectively eliminating it altogether. Unlike a magnetic compass, it can output a signal to repeaters
spaced around the vessel at critical positions. But it also requires a constant source of stable electrical
power. If power is lost, it requires several hours to settle on the meridian again before it can be used.
Vessels operating in high latitudes must construct error curves based on latitudes because the errors
at high latitudes eventually overcome the ability of the compass to correct them. The gyrocompass is
typically located below decks as close as possible to the center of roll, pitch and yaw of the ship, thus
minimizing errors caused by the ship’s motion.
Repeaters are located at convenient places throughout the ship, such as at the helm for steering, on
the bridge wings for taking bearings, in after steering for emergency steering, and other places. The
output can also be used to drive course recorders, autopilot systems, plotters, fire control systems,
and stabilized radars. The repeaters should be checked regularly against the master to ensure they
are all in alignment. The repeaters on the bridge wing used for taking bearings will likely be equipped
with removable bearing circles, azimuth circles, and telescopic alidades, which allow one to sight a
distant object and see its exact gyrocompass bearing.
7
The total of the all the combined errors of the gyrocompass is called gyro error and is expressed in
degrees E or W, just like variation and deviation. But gyro error, unlike magnetic compass error, and
being independent of Earth’s magnetic field, will be constant in one direction; that is, an error of one
degree east will apply to all bearings all around the compass.
The errors to which a gyrocompass is subject are:
 speed error
 latitude error
 ballistic deflection error
 ballistic damping error
 quadrantal error
 gimballing error
Additional errors may be introduced by a malfunction or incorrect alignment with the centerline of the
vessel.
Speed error is caused by the fact that a gyrocompass only moves directly east or west when it is
stationary (on the rotating earth) or placed on a vessel moving exactly east or west.
Tangent latitude error is a property only of gyros with mercury ballistics, and is easterly in north
latitudes and westerly in south latitudes.
Ballistic deflection error occurs when there is a marked change in the north-south component of the
speed. East-west accelerations have no effect. A change of course or speed also results in speed
error in the opposite direction, and the two tend to cancel each other if the compass is properly
designed.
Ballistic damping error is a temporary oscillation introduced by changes in course or speed. During a
change in course or speed, the mercury in the ballistic is subjected to centrifugal and acceleration/
deceleration forces. This causes a torqueing of the spin axis and subsequent error in the compass
reading.
Quadrantal error has two causes. The first occurs if the center of gravity of the gyro is not exactly
centered in the phantom. This causes the gyro to tend to swing along its heavy axis as the vessel rolls
in the sea.
The second source of quadrantal error is more difficult to eliminate. As a vessel rolls in the sea, the
apparent vertical axis is displaced, first to one side and then the other. The vertical axis of the gyro
tends to align itself with the apparent vertical.
Gimballing error is caused by taking readings from the compass card when it is tilted from the
horizontal plane. It applies to the compass itself and to all repeaters.
8
An AlphaMidiCourse consist of the following main components:
- Gyro compass with automatic speed error correction
- Control Unit
The AlphaMidiCourse is a self-contained precision navigation instrument capable of supplying
heading reference information simultaneously to a wide range of equipment located on board the
vessel. To support this wide range of equipment, the AlphaMidiCourse can supply heading
information simultaneously through multiple channels using any of the common transmission
formats.
On a typical vessel heading information is used
among others by:
 Autopilot
 Radars
 Radio direction finder
 Course plotter and course recorder
 Satellite communication systems
 Satellite television
The AlphaMidiCourse is wheel mark
approved.
A GPS should be connected to the AlphaMidiCourse
to feed data to the gyrocompass allowing a small
computer to apply a correction.
The Control Unit, supplied with the AlphaMidiCourse, provides all the functions and indicators
necessary to power-up, control and operate the AlphaMidiCourse. The Control Units displays all
information in a two rows of four-characters LED and can show the following information:
 Heading in degrees from 0.0 to 359.9
 Heading source
 Latitude from 70S to 70N
 Speed in knots from 0 to 70
 Speed source
 Steering source
 Rate of Turn
 Alarms and status information
 Presence of power and readiness of
gyro compass for operation.
 Timer
The Control Unit is used for connecting the AlphaMidiCourse but also to connect ships’ cabling, like
power and data cable to aggerate all relevant data for input and output.
9
Follow-up speed
Settling time
Estimated service life
0 - 50 knots – AlphaMidiCourse
0 - 70 knots – AlphaMidiCourse HS
>75°/sec
within 3 hours (if startup heading is within +/-5° of actual heading)
35000h
Settle point error
Dynamic Accuracy
Settle Point Repeatability
< ±0.3º
< ±0,5° sec(phi)
< ±0,2° sec (phi)
Step
Serial Data
Serial data transfer rate
Analogue rate of turn
Failure
Alarm output
1 connection; 24V DC – 6 step/°
4 connections, 4x RS422/ RS485
IEC61162-1 (4800 bps) or IEC61162-2 (38400 bps)
1 x ROT Analogue, 30°/min ±5V; 120°/min ±10V; 300°/min ±10V
NO relay/NC relay
NO relay/NC relay
External heading
Latitude
Speed
NMEA 0183 via RS422 from GPS
NMEA 0183 via RS422 from GPS
Pulse at 200/ 400 per nm from log (dry contact)
NMEA0183 via RS422 from log
Power supply
Power consumption:
Start
Ordinary
24V DC, 70W
Range of speed
AlphaMidiCourse
Height
Width
Depth
Weight
within 140VA
within 70VA
438 mm (17.2”)
340 mm (13.4”)
340 mm (13.4”)
23 kg (51lbs)
Control Unit
Height
Width
Depth
Weight
252 mm (9.9”)
278 mm (10.9”)
126 mm (5.0”)
7 kg (15lbs)
10
The repeater compass receives the ship’s heading bearing signal
transmitted from the master compass and remotely indicates the
bearing.
The repeater (weight: 5 kg) has an analogue display for the
indication of the heading display. The case is made of GRP (Glass
fiber Reinforced Plastic, thus corrosion free) and has a waterproof
construction, able to use on open deck.
The repeater (ø246,3 mm) will be delivered with 1.8 meter cable.
The repeater compass mounting bracket has a gimbal ring to
support the repeater compass horizontally when the ship is rolling
and pitching. The repeater compass is supported with the pins in
the gimbal ring.
A junction box, fixed on the bracket, consists a switch, a dimmer
for illumination and terminal boards to connect the signal cable
from the master compass and the cable to the repeater compass.
The bracket weighs 8 kg and has a diameter of 354 mm.
The repeater stand (height: 1330 mm.) can be used when a
repeater compass is installed on the deck.
The repeater stand (weight: 25 kg) has gimbal ring at the upper
part of the stand to support the repeater compass horizontally,
even when the wipe is rolling and pitching. The stand body is
made of GRP (Glass fiber Reinforced Plastic, thus corrosion free)
and has a waterproof construction, able to use on open deck.
At the middle part of the stand, there is a switch for
dimmer and illumination.
The azimuth circle can be placed on the bezel ring of the repeater
compass to support the repeater compass horizontally with two
levels. In this condition, astronomical observation can be made
with the mirror and the slit located on the azimuth circle, and
measurements of objects with the lubber’s line and the slit.
The azimuth circle weighs 2.2 kg and has a diameter of 260,5 mm
and will be delivered in a storage box
11
Bridge Alert Management system (BAM) helps to improve the handling, forwarding and presentation
of alerts. In doing so, it harmonizes the priority, classification, handling, distribution and presentation
of alerts, meaning that the bridge team can devote its full attention to the safe operation of the ship
and immediately identify any alert situation requiring action to maintain the safe operation of the ship.
The IMO recommends the use of bridge alert management systems to governments for those ships
flying their flags. BAM installed on bridges should at least conform to the performance requirements
stated in the annex to IMO Resolution MSC.302(87). Ships are not required to carry BAM equipment.
The Annunciator unit can be connected to the
AlphaMidiCourse to comply to Bridge Alert
Management system regulations.
The annunciator unit communicates to the Central
Alert Management system (CAM): status about
alert state reporting (ALF), a list of active alerts (ALC),
refuse incoming bad formatted alert commands (ARC)
and Heartbeat Supervision Report (HBT). The unit
accepts HBT from the bridges central alert
management system.
Note: At this moment of publishing, the annunciator is available but part numbers are still pending.
Please contact your sales representative for more information if needed.
The NMEA Distribution Interface is used where the
IEC61162 signal from a sensor must be distributed
to multiple listeners. The system provides galvanic
isolation between talker and listeners, and between
listeners to avoid problems when a listener is
defective.
The NMEA distribution interface can be
concatenated with multiple NMEA distribution
interfaces by connecting a small busbar which
create one too many outputs.
: (IEC61162-1) serial port @ 4800baud
:1
:4
3401.0240
NMEA Distribution Interface Mk.2
12
The AlphaLine Repeater Displays MF range provides
a heading indicator (MED) or a heading repeater
connectable to gyro, magnetic and GPS compass
showing the ship’s heading information.
This advanced compass repeater has an analogue
moving compass card and fixed lubber line. The LCD
information screen displays digital course trend, alarm
and rate of turn.
The dimmable backlight (manual or central) of the
LCD screen has manual selectable themes, day, dusk
and night.
Next to the AlphaHeading instruments, the more
advanced Alphaheading+ instruments are available.
The Alphaheading+ is showing the ship’s Heading
information and additionally, the extended scale also
provides an accurate analog representation of tenths
of degrees (no ROT information).
: (audible and visual alarm)
- Signal loss
: Heading, magnetic or true
Rate of Turn
: (IEC61162-1) serial port @ 4800baud
: $--DDC
$--ROT
$--HDT (default), $--HDG, $--HDM,
$--THS
3803.0226
3803.0228
AlphaLine Repeater Display MFS-H grey version
AlphaLine Repeater Display MFS-H black version
3803.0230
3803.0232
AlphaLine Repeater Display MFS-V grey version
AlphaLine Repeater Display MFS-V black version
3803.0242
3803.0244
3106.0110
3106.0112
AlphaLine Repeater Display MFM grey version
AlphaLine Repeater Display MFM black version
AlphaHeading MFM grey version
AlphaHeading MFM black version
3803.0246
3803.0248
3106.0114
3106.0116
AlphaLine Repeater Display MFL grey version
AlphaLine Repeater Display MFL black version
AlphaHeading (MED) grey version
AlphaHeading (MED) black version
3106.0118
3106.0120
AlphaHeading+ (MED) grey version
AlphaHeading+ (MED) black version
Note: Please check the AlphaLine Repeater Display MF Sales Guide for more detailed information.
13
The Control Unit is used for connecting the
AlphaMidiCourse but also to connect ships’ cabling, like
power and data cable to aggerate all relevant data for input
and output.
For this reason, the Control unit features a large number of
terminal blocks.
External heading
Latitude
Speed
NMEA 0183 via RS422 from GPS
NMEA 0183 via RS422 from GPS
Pulse at 200/ 400 per nm from log (dry contact)
NMEA0183 via RS422 from log
Step
Serial Data
Analogue rate of turn
Serial data transfer rate
Failure
Alarm output
1 connection; 24V DC – 6 step/°
4 connections,4x RS422/ RS485
1 x ROT Analogue, 30°/min ±5V; 120°/min ±10V; 300°/min ±10V
IEC61162-1 (4800 bps) or IEC61162-2 (38400 bps)
NO relay/NC relay
NO relay/NC relay
Power supply
24V DC, 70W
14
15
16
17
Through experience and study of environment rules and regulations of the various classification
societies, we have made a table for a quick overview of what might be needed to offer a system.
Although this is made with accuracy, it is possible that the relevant surveyor can make comments or
suggestions about the installation.
Please note that this table is only a guide to help you as a starting-point and therefor Alphatron Marine
BV does not accept liability for any consequences related to the completeness and compliance with
regulation requirements at any moment in time.
The AlphaMidiCourse is approved as a gyro compass and is mandatory equipment with respect to the
following requirements and regulations:
GYRO COMPASS, Chapter V: Safety of navigation , Regulation 19, Chapter 2.5:
2.5 All ships of 500 gross tonnage and upwards shall, in addition to meeting the requirements of
paragraph 2.3 with the exception of paragraphs 2.3.3 and 2.3.5, and the requirements of
paragraph 2.4, have:
2.5.1 a gyro compass, or other means, to determine and display their heading by shipborne
non-magnetic means, being clearly readable by the helmsman at the main steering
position. These means shall also transmit heading information for input to the
equipment referred in paragraphs 2.3.2, 2.4 and 2.5.5;
2.5.2 a gyro compass heading repeater, or other means, to supply heading information
visually at the emergency steering position if provided;
2.5.3 a gyro compass bearing repeater, or other means, to take bearings, over an arc of the
horizon of 360º, using the gyro compass or other means referred to in subparagraph
.1. However ships less than 1,600 gross tonnage shall be fitted with such means as far
as possible;
Organization/ Convention/
Classification Society
Remarks
SOLAS
IMO Resolution A.424(11)
Comply
IMO Resolution A.821(19)
MED
Chapter V: Safety of navigation ,Regulation 19, Chapter 2.
Perfomance Standard Gyro compasses
Presentation of navigation-related information on
shipborne navigational displays
High-Speed Craft
Marine Equipment Directive (Wheelmark)
Bureau Veritas
Rules for the Classification of High Speed Craft
Yes
Lloyds Register
Classification of Ships (Part 7, chapter 9, section 3.1.7)
Yes
DNV
Rules for the Classification of Ships (Part 6, chapter 7)
Dynamic Postion Systems
Yes(2)
IMO Resolution A.694(17)
Rules for the Classification of Ships
(Part 6, chapter 8) Nautical Safety
Nautical safety Offshore Service Vessels
DNV
DNV - NAUT-OSV(T)
Needed
UPS
required?
Yes
Yes
Yes
Yes (HS version)
Yes
Yes
PoB(1) >100
Yes
Yes,
depending
on system
DPS 0,1,2,3
Depending on
system
DPS 0,1,2,3
Yes
2
At least
10 min
Yes
Yes
min. 2 pcs
30 min
Notes:
1
2
POB mains People on Board and refers to passengers
One of the three required gyros may be replaced by a heading device based upon another principle, as long as this
heading device is type approved as a THD (Transmitting Heading Device) as specified in IMO Res. MSC.116 (73).
18
Depending on the class and the notation of the vessel more than one gyro compass might be required.
For instance for LR IBS, DNV NAUT-OSV(A) and also DP notations (all classes):
 DP0: 1 gyro required
standard navigation gyro can be used (only);
 DP1: 2 gyro’s required standard navigation gyro can be used, as well as one additional gyro;
 DP2: 3 gyro’s required standard navigation gyro can be used, as well as two additional gyro’s;
 DP3: 3 gyro’s required standard navigation gyro can be used, as well as two additional gyro’s of
which one is separated (A60) for in case of fire/flooding.
Remark:
 In case of DP, the gyro signal is distributed directly from the gyro to each DP system directly
 In case of DP, each gyro is powered from (DP) UPS
Tonnage
Vessel
THD
1,2
Gyrocompass
1
Gyrocompass
bearingrepeater at
emergency steering
position 1
Gyrocompass
bearingrepeaters
(360°) 1
< 150 gt
Passenger Ship
Cargo Vessel
Mandatory
150 – 299 gt
Passenger Ship
Cargo Vessel
Mandatory
300 – 499 gt
Passenger Ship
Cargo Vessel
Mandatory
Mandatory
500 – 2999 gt
Passenger Ship
Cargo Vessel
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory 3
Mandatory 3
3000 – 9999 gt
Passenger Ship
Cargo Vessel
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
10000 – 40000 gt
Passenger Ship
Cargo Vessel
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
≥ 50000gt
Passenger Ship
Cargo Vessel
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
300 – 499 gt
Passenger Ship
Cargo Vessel
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
≥ 500gt
Passenger Ship
Cargo Vessel
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Notes:
1
2
3
Approved alternative means are permitted
Transmitting Heading Device (THD) – Gyro, electricmagnetic or satellite
On ships < 1600 gt only if possible
Depending on the owner and or type of vessel, one can decide to supply extra gyro’s in order to
optimize safety of vessel crew and environment. The AlphaMidiCourse can only be used in this
configuration as stand-alone unit. For other configurations with extra gyro’s or GPS compasses,
please check the sales guides of the AlphaMiniCourse or AlphaFiberCourse.
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Most competitive price for a Gyro compass at the market
High static and dynamic accuracy (latitude and speed compensation)
Easy installation and adjustment
Heading against the geographical meridian at the vessel speed up to 70 knots
Latitude up to 70 degrees, roll and pitch angles up to 45 degrees
Low power consumption
MTBF average >35.000 hours
Dry gyro principal so no heating and liquid are required
MED wheel mark approval
Standard outputs: 4x RS422/ RS485 and 1x step
Standard equipped with speed and latitude correction
Sperry Marine
Tokyo Keiki
Teledyne TSS
Anschütz
Simrad
Yokogawa
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Container ships, cargo ships, bulk ships
DP operating vessels, drilling ships
Cruise ships, ferries, Ro-Ro
Fishing, Tugs, workboats, scientific, seismic, marine construction
Research vessels, survey vessels
Fast Patrol boats, high speed vessels, yachts
The AlphaMidiCourse can only be used in this configuration as stand-alone unit. For other
configurations with extra gyro’s or GPS compasses, please check the sales guides of the
AlphaMiniCourse or AlphaFiberCourse.
Alphatron Marine is free to sell in the whole world expect to countries with export limitations according
to EU rules, so called black listed countries. Furthermore sales of the AlphaMidiCourse is not allowed
in Japan ,China and Korea with the only exemption that when the gyro is used for workboat and
offshore vessels and in combination with AlphaBridge.
The OEM-agreement stated:
Territory: The world excluding Japan, the Republic of Korea and the People's Republic of China.
However, if ALPHATRON's ALPHA BRIDGE has been specified by the Japanese, Korean or Chinese
shipyard for an OFFSHORE or WORKBOAT Vessel related project, ALPHATRON shall be allowed to
provide the Product together with the ALPHA BRIDGE.
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The AlphaMidiCourse is designed to meet the requirements of the following:
 IMO Resolution А.424 (ХI), Performance Standards for Gyro compasses
 ISO 8728:1997, Ships and marine technology. Marine gyro compasses
The AlphaMidiCourse (HS) is designed to meet the requirements of the following:
 IMO Resolution А.821 (19), Performance Standards for Gyro compasses for High-Speed Craft
 ISO 16328:2014, Ships and marine technology. Marine gyro compasses for High-Speed Craft
Following requirements are applicable for both versions:
 Wheelmark, The Marine Equipment Directive 96/98/ЕС
 IEC 60945 (2002), General Requirements – Methods of testing and required test results
 СЕ marking
 Electromagnetic Compatibility (EMC) Directive
 The Marine Equipment Directive 96/98/ЕС
 IEC 61162-1:2000 (Е) Marine navigation and radio communication equipment and systems –
Digital interfaces.
Since February 17 1997 a Directive on Marine Equipment or with other
words, Marine Equipment Directive (MED), has been in force in the European
Economic Area (EEA). The Marine Equipment Directive 96/98/EC as
amended, relates to the EU requirements for transportation and international
maritime conventions (IMO, SOLAS) and international standards (IEC, ISO)
and requires the Mark of Conformity, a ship wheel.
The MED Mark of Conformity or “Wheelmark” is required for equipment to be
placed on board of EU member state ships and ships of countries which have
agreed to apply the MED. This directive applies to the following equipment
categories:
 Life-saving appliances (SOLAS III)
 Marine pollution prevention (MARPOL)
 Fire protection equipment (SOLAS II-2)
 Navigation equipment (SOLAS V)
 Radio communication equipment (SOLAS IV)
 Equipment under COLREG 72
 Equipment under SOLAS II-1
The Mark of Conformity confirms that equipment complies with the Marine
Equipment Directive as well as other applicable Directives and ensures the
free movement of products within the European Union (EU) and offers
conformity assessment procedures.
Compliance with MED requirements leads to cost reduction for manufacturers
who no longer will have to produce multinational versions of their equipment.
Only one approval per type of equipment can be achieved by passing a
conformity assessment procedure performed by only one Notified Body.
Due to the MRA (Mutual Recognition Agreement) between the EC and the
USA the Notified Body is authorized to issue US Coast Guard approval
numbers without additional testing or certification.
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Part number
Description
3107.9134
AlphaMidiCourse gyro compass
AlphaMidiCourse gyro compass (incl. control box) - 24VDC version
3107.9136
AlphaMidiCourse gyro compass - High Speed
AlphaMidiCourse gyro compass (incl. control box) - 24VDC version
3107.9138
3107.9140
3107.9142
3107.9146
3090.0000
3401.0240
Accessoires
Steering repeater compass, serial data
Bearing repeater compass, serial data
BB repeater holder, bearing bracket, serial data
BH repeater stand
Azimuth circle (including storage box)
Annunciator for response to INS/ Bridge Alert Management
NMEA distribution module mk.2
3803.0226
3803.0228
Alphaline MFS-H
Alphaline Repeater Display MFS-H grey
Alphaline Repeater Display MFS-H black
3803.0230
3803.0232
Alphaline MFS-V
Alphaline Repeater Display MFS-V grey
Alphaline Repeater Display MFS-V black
3803.0242
3803.0244
3106.0110
3106.0112
Alphaline MFM
Alphaline Repeater Display MFM grey
Alphaline Repeater Display MFM black
AlphaHeading MFM (MED) grey
AlphaHeading MFM (MED) black
3803.0246
3803.0248
3106.0114
3106.0116
3106.0118
3106.0120
Alphaline MFL
Alphaline Repeater Display MFL grey
Alphaline Repeater Display MFL black
AlphaHeading MFL (MED) grey
AlphaHeading MFL (MED) black
AlphaHeading+ MFL (MED) grey
AlphaHeading+ MFL (MED) black
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