Product information guide | Garmin GPSMAP 400 GPS Receiver User Manual

GPSMAP 400/500 Series Installation Instructions
Your GPSMAP 400/500 series chartplotter must be properly installed according to the following instructions. You need the appropriate
fasteners, tools, and mounts listed in each section. If you experience difficulty installing the chartplotter, seek the assistance of a
professional installer, or contact Garmin Product Support.
Before installing your GPSMAP 400 or 500 series chartplotter, confirm that the package contains the items listed on the box. If any parts are
missing, contact your Garmin dealer immediately.
WARNING: See the Important Safety and Product Information guide in the product box for product warnings and other important
Warning: Always wear safety goggles, ear protection, and a dust mask when drilling, cutting, or sanding.
notice: When drilling or cutting, always check the opposite side of the drilling or cutting surface.
To install and use your chartplotter:
1 Select a mounting location (page 2).
2. Mount the chartplotter (page 2).
3. Install the transducer, if applicable (page 3).
4. Install the wiring harness (page 6).
5. Connect the chartplotter to a NMEA 2000 network (optional, if applicable) (page 8).
6. Connect the cables to the chartplotter (page 9).
7. Test the installation (page 9).
Chartplotter Functionality Matrix
The chartplotters in the GPSMAP 400/500 series have different functionality based on model number. Use this matrix to determine the feature
set and installation requirements of your chartplotter.
September 2009
NMEA 2000
NMEA 0183
Garmin CANet
GPSMAP 420/430/430x/440/440x/450
“s” version only
GPSMAP 520/525/530/535/540/545/550/555
“s” version only
GPSMAP 421/441/451
“s” version only
GPSMAP 431/531
“s” version only
GPSMAP 521/526/536/541/546/551/556
“s” version only
190-01074-02 Rev. B
Printed in Taiwan
Selecting a Mounting Location
Consider the following when selecting a location to mount your chartplotter:
The location provides optimal viewing as you operate your boat.
The location allows for easy access to the keypad on the chartplotter.
The location is strong enough to support the weight of the chartplotter and protect it from excessive vibration or shock.
Refer to the compass-safe distance table on page 10 to avoid interference with your magnetic compass.
The location allows room for the routing and connection of the cables. There should be at least a 3 in. (8 cm) clearance behind the case.
notice: Do not mount the chartplotter in an area that is exposed to extreme temperature or conditions. The temperature range for the chartplotter is
from 5°F to 131°F (from -15°C to 55°C). Extended exposure to temperatures exceeding this range (in storage or operating conditions) may cause failure
of the LCD screen. This type of failure and related consequences are not covered by the manufacturer’s limited warranty.
Mounting the Chartplotter
There are two mounting options for the chartplotter:
• Surface Mount—mount the chartplotter onto a bracket (included) that attaches to the console or overhead. The compact waterproof
chartplotter housing is suitable for mounting in exposed locations or at the navigation station.
• Flush Mount—use an optional flush mount kit to mount the chartplotter into a flat panel. For more information on the optional flush mount
kit, visit or contact your local Garmin dealer.
Surface-Mounting the Chartplotter
Use the included bracket to surface-mount the chartplotter. You will need the following tools and fasteners:
• Drill
• Phillips or flat screwdriver
• Three #8 (4 mm) pan-head machine bolts with matching nuts and washers and a 5/32 in. (5 mm) drill bit,
or three #8 pan-head self-tapping screws and a 1/16 in. (1.5 mm) drill bit for drilling starter holes.
Notice: Use pan-head machine bolts or self-tapping screws to secure the swivel base. If you use screws with countersunk heads, you may damage the
mounting bracket.
To mount the bracket assembly:
1. Using the swivel base as a template, mark the location of the three holes that secure the bracket to the
mounting surface.
2. Drill the mounting holes.
• If you secure the base with machine bolts, drill three 5/32 in. (5 mm) holes at the locations you
• If you secure the base with self-tapping screws, drill three 1/16 in. (1.5 mm) starter holes at the
locations you marked. Do not make the starter holes deeper than half the screw length.
3. Secure the swivel base with three bolts or screws. Do not overtighten the screws or bolts; you may
damage the swivel base.
4. Place the swivel mount bracket over the swivel base and secure it with the short knob.
To install the chartplotter on the mounting bracket:
1. Align the slot on the back of the chartplotter with the long mounting knob, and slide
the chartplotter into place. If necessary, adjust the knob to spread the bracket arms
apart. (Turn the knob counter-clockwise to widen the bracket arms and clockwise to
2. Adjust the chartplotter angle, and tighten the long mounting knob until the chartplotter
is snug.
3. Rotate the swivel mount bracket by twisting it left or right. The bracket clicks as you
turn it. Select a good viewing angle, and then tighten both knobs.
GPSMAP 400/500 Series Installation Instructions
Installing a Transducer
Consult the chartplotter feature matrix on page 1 to determine if your chartplotter is capable of using sonar. The following transducer
installation procedures are only applicable to sonar-capable chartplotters.
NOTE: The following procedures contain installation instructions for the transducer included with the “s” model GPSMAP 400/500 series
chartplotters. If you choose to use a different transducer, installation instructions are provided in the transducer kits. Some transducers might
have to be installed by a professional marine installer.
Proper transducer installation is key to getting the best performance from your sonar-capable chartplotter. Be sure you have the following
components in the transducer package, as well as the following tools:
Transducer Package
• Transom-mount transducer (not pictured)
A – 5 mm flat washers (2)
B – 5 × 30 mm screws (2)
C – 10-32 lock nut (1)
D – 4 × 12 mm screw (4)
E – 10-32 × 1.75 in. screw (1)
F – 1/4 in. cable clamps (2)
G – Plastic spacer (1)
H – 1/4 in. rubber washer (1)
I – Cable tie, 5.6 in. (4)
J – Cable entry cover (1)
Tools Needed
• Drill and drill bits
• 3/8 in. (9.5 mm) wrench or socket
• Masking tape
• Number 2 Phillips screwdriver
• Marine sealant
Notice: Do not cut the transducer lead or any part of the transducer cable. Cutting the transducer cable voids your warranty. The cable cannot be
spliced and connected to any existing (Garmin or non-Garmin) transducer cables. If the transducer lead is too short, extension cables are available from
your Garmin dealer.
Assembling the Transducer
1. Insert the rubber washer (H) and the plastic spacer (G) into the transducer
at the same time. DO NOT lubricate the rubber washer.
2. Route the power/data cable toward the back of the transducer. Slide the
transducer into the transducer mount.
3. Place a 5 mm flat washer (A) on the 10-32 × 1.75 in. screw (E), and insert
the screw through the transducer mount, the spacer, and the rubber
4. Place the remaining 5 mm flat washer (A) on the exposed end of the 10-32
× 1.75 in. screw. Install the 10-32 locknut (C) finger tight. Retighten the
transducer after installation on the boat.
Cable tie slot
Back of the transducer
Mounting the Transducer on a Transom
When selecting a transom-mount location, consider the following for optimal performance:
For your sonar to operate properly, the transducer must be located in calm water.
Mount the transducer as close to the center of the boat as possible.
Do not mount the transducer in locations where it might be jarred when launching, hauling, or storing.
Do not mount the transducer in the path of the propeller on single-drive boats. The transducer can cause cavitation that can degrade the
performance of the boat and damage the propeller. On twin-drive boats, mount the transducer between the drives, if possible.
NOTE: Do not mount the transducer behind strakes, struts, fittings, water intake or discharge ports, or anything that creates air bubbles or
causes the water to become turbulent. The transducer must be in clean (non-turbulent) water for optimal performance.
GPSMAP 400/500 Series Installation Instructions
To mount the transducer on a transom:
1. Position the transducer mount at the selected transom location. Make sure the transducer is parallel with the water line. Mark the center
locations of each hole on the transducer mount.
Apply marine sealant to all screw
threads to prevent water from
seeping into the transom.
Mount the transducer
cable cover far above
the waterline.
The transducer should
extend 1/8 in. (3.2 mm)
below a fiberglass hull or
3/8 in. (9.5 mm) below an
aluminum hull.
Ensure that the transducer is
below water level when the boat
is on plane at high speed.
Mount the transducer parallel
with the bottom.
Do not mount the transducer directly in the path of the
propeller. The transducer can cause cavitation that may
degrade the boat performance and damage the propeller.
2. Drill 5/32 in. (4 mm) pilot holes approximately 1 in. (25 mm) deep at the marked locations. To avoid drilling the holes too deep, wrap a piece of
tape around the bit at 1 in. (25 mm) from the point of the bit.
3. Apply marine sealant to the 5 × 30 mm screws (B). Attach the transducer assembly to the transom using the 5 × 30 mm screws. Adjust the
transducer assembly to extend beyond the bottom of the transom approximately 1/8 in. (3.2 mm) on fiberglass hulls or 3/8 in. (9.5 mm) on
aluminum hulls. Adjust the transducer assembly to be aligned parallel with the bottom.
4. Tighten the 10-32 locking nut until it touches the mounting bracket, and then tighten 1/4 turn more. (Do not overtighten.)
5. Place the first cable clamp (F) on the transducer cable, approximately one third of the distance between the transducer and the top of the
6. Mark the location. Drill a 1/8 in. (3.2 mm) pilot hole approximately 3/8 in. (9.5 mm) deep.
7. Attach the cable clamp using one of the 4 × 12 mm screws (D). Coat the screw with marine sealant before installation. Repeat steps 5 and 6
using the other cable clamp.
8. Route the transducer cable to the GPSMAP 400/500 series chartplotter.
Notice: Avoid routing the cable close to electrical wires or other sources of electrical interference.
9. Test the transducer installation after you complete the GPSMAP 400/500 series chartplotter installation. See page 9.
Mounting a Transducer on a Trolling Motor
1. With the ridges of the band facing up, slide the large cable tie through the slot on the transducer mount until equal lengths extend on both
sides of the mount.
notice: For cold water and heavy timber or debris areas, a metal 4-5 in. (100-125 mm) worm gear clamp is recommended instead of the plastic
cable tie.
2. Position the mount gasket on the curved top of the transducer mount.
3. With the front of the transducer pointed away from the trolling motor propeller, place the transducer
assembly against the motor body of the trolling motor.
4. Wrap the two ends of the cable tie around the motor body. Place the pointed end of the cable tie through
the fastener hole on the opposite end and pull it through until it is snug but not tight. (The cable tie clicks
when you pull it.)
5. Position the transducer so that it is parallel with the bottom when in use, making sure the gasket is
aligned properly. Pull the cable tie end until tight. Trim off the excess if necessary. Tighten the locking nut
until it touches the mounting bracket, and then tighten 1/4 turn more. (Do not overtighten.)
Cable tie
Front of the transducer
GPSMAP 400/500 Series Installation Instructions
6. Route the transducer cable to the GPSMAP 400/500 series chartplotter using cable ties to secure the cable to the motor shaft. You can fill
the forward-facing portion (except the cable tie pocket) of the transducer mount with sealant to avoid accumulating debris.
Notice: Leave some slack in the cable to avoid damage while using the trolling motor.
Notice: Avoid routing the cable close to electrical wires or other sources of electrical interference.
Shoot-Thru-Hull Installation
To avoid drilling a hole to mount a thru-hull transducer, a transom-mount transducer can be secured with epoxy inside a boat (shoot-thru-hull
installation). This type of installation can provide better noise reduction and allow you to use a higher gain setting. For a transducer to be
mounted inside the hull (shoot-thru, not thru-hull), the boat must be fiberglass with no core. Contact your boat manufacturer if you are unsure.
Professional installation might be necessary.
Some transducers are specifically designed to be mounted inside a fiberglass hull. The standard plastic transom-mount transducer can also be
mounted using this method. If using a temperature-sensing transducer, the temperature displayed reflects the hull temperature.
NOTE: A solid fiberglass hull can be no more than 5/8 in. (9.53 mm) thick when using a 500 W transducer, and no more than 1 in. (25.4 mm)
thick when using a 1 kW transducer. 1 kW transducers are only compatible with either the GPSMAP 525/535/545/555/526/536/546/556 or with
non “s” models compatible with a GSD 22.
When installing a transducer, consider the following:
• The hull must be composed of solid fiberglass without air bubbles, laminates, fillers, or dead air space.
• The location must be in an area of clean (non-turbulent) water at all speeds.
• The location must not be over any strakes or behind any obstruction on the hull that would create turbulence.
NOTE: Many modern hulls have a dedicated pocket for shoot-thru-hull transducer installation. If you are unsure whether your hull is equipped
with a pre-located pocket, contact your hull manufacturer.
To test the location:
1. Fabricate a test device from a section of PVC pipe or a can, as shown in the following illustration.
2. Temporarily seal the test device to the hull with caulking or RTV sealer, and fill the test device with water or light mineral oil.
3. Place the transducer in the water, pointed directly at the bottom, weighted down. Set the device for optimum performance. If the sonar
performance is significantly degraded, another location must be tested.
PVC pipe
or a can
Strip caulk or
RTV sealer
Weight the transducer
to hold it in place.
Fill a pipe or a can with
water or a light mineral oil.
Hull surface
Testing the Location
To permanently install the transducer:
1. Lightly sand the surface of the hull and the face of the transducer with 400-grit wet or dry sandpaper.
2. Build a dam using strip caulk about 1/4 in. (6 mm) tall. Pour about 1/8 in. (3 mm) of two-part, slow-cure epoxy into the dam.
3. Place the transducer in the epoxy, turning the transducer to work out any air bubbles.
4. Weight the transducer in place, and allow it to cure for 24 hours.
GPSMAP 400/500 Series Installation Instructions
Installing the Wiring Harness
The chartplotter comes with a wiring harness that connects the chartplotter to power and to optional NMEA 0183 and Garmin CANet devices.
If applicable, the wiring harness also connects the chartplotter to a transducer.
3 A se
The wiring harness does not connect to a NMEA 2000 network. For instructions on connecting to a NMEA 2000 network with compatible
devices, see page 8.
To the GPSMAP 400/500
series chartplotter
Wire Color
Wire Function
Power (10–32 Vdc*)
(power and NMEA 0183)
NMEA 0183 port 1 Tx (out)
NMEA 0183 port 1 Rx (in)
NMEA 0183 port 2 Tx (out)
NMEA 0183 port 2 Rx (in)
CANet L (if applicable)
CANet H (if applicable)
Accessory on
Alarm low
To transducer (if applicable)
GPSMAP 400/500 Series Wiring Harness
• Use an AGC/ 3AG - 3 Amp replacement fuse.
• If it is necessary to extend the power and ground wires, use 22 AWG wire.
• You can wire the harness directly to the battery, or if your boat has an electrical system, you might be able to wire the harness to an
unused holder on the fuse block. If you use the boat fuse block, remove the in-line fuse holder on the power wire of the harness.
• Do not cut the transducer cable, because this voids your warranty.
Notice: The maximum input voltage is 32 Vdc*. Do not exceed this voltage because this can damage the chartplotter and void the warranty.
NOTE: During a typical installation, use only the red and black wires. The other wires do not have to be connected for normal operation of the
chartplotter. For information on connecting to a NMEA 0183- or Garmin CANet-compatible device, see page 8.
Connecting the Wiring Harness to Power
To 10–32 Vdc* boat supply
To device
Fuse Block Example
3 A fuse
1. Use a test light or voltmeter to determine the polarity of the voltage source.
2. Connect the red (+ or positive) wire to the positive voltage terminal. (If you use the
fuse block on the boat, route the positive connection through the fuse, as shown on the
3. Connect the black (- or ground) wire to the negative voltage terminal.
4. Install or check the 3 A fuse (in the in-line fuse holder, or on the fuse block of the boat).
* Certain GPSMAP 400/500 series chartplotters can be connected to higher-voltage power sources. Refer to the
Power section of the System Specifications on page 10 for more information.
GPSMAP 400/500 Series Installation Instructions
Connecting the Wiring Harness to a NMEA 0183 Device
You can connect the GPSMAP device to other NMEA compatible equipment, such as a DSC or AIS device. Refer to the wiring diagram for
connecting the chartplotter to NMEA 0183-compatible devices.
10–32 Vdc*
Wire color
Wire function
Red (power)
Black (ground)
Power ground
NMEA Ground
Blue (out)
NMEA 0183
compliant device
NMEA Rx/A (+) >
NMEA Tx/A (+)
Brown (in)
Wiring a GPSMAP 400/500 Series Chartplotter to a Standard NMEA 0183 Device
To connect the wiring harness to a NMEA 0183 device:
1. For Garmin devices, the ground (black) wires serve as NMEA 0183 ground and must be attached together or on the same terminal as the
NMEA 0183 ground on your NMEA 0183 device. Refer to the wiring diagram of your NMEA 0183 device for wire identification.
2. Connect the blue (NMEA 0183 port 1 out) wire from the GPSMAP 400/500 wiring harness to the NMEA 0183 in (or Rx/A +) wire on the
wiring harness of the NMEA 0183 device, and the brown (NMEA 0183 port 1 in) wire to the NMEA out (or Tx/A +) wire on the wiring harness
of the NMEA 0183 device.
3. Repeat step 2 using the grey and violet wires for an additional NMEA 0183 device.
4. Set the serial port(s) on the chartplotter to use NMEA 0183 data (standard or high speed). See the GPSMAP 400/500 Series Owner’s
Manual for more information.
Connecting the Wiring Harness to an Optional Horn, Lamp, or Both
The GPSMAP 400/500 series chartplotter can be used with a lamp, a horn, or both, to sound or flash an alert when the chartplotter displays a
message. The alarm does not need to be wired for the GPSMAP 400/500 chartplotter to function. The alarm circuit switches to a low-voltage
state when the alarm sounds. The maximum current is 100 mA, and a relay is needed to limit the current from the chartplotter to 100 mA. To
select between visual and audible alerts, install a switch.
Wire color
10–32 Vdc*
Black (ground)
Yellow (alarm)
100 ma max
coil current
Wiring a GPSMAP 400/500 Series Chartplotter to a Horn, a Lamp, or Both
* Certain GPSMAP 400/500 series chartplotters can be connected to higher-voltage power sources. Refer to the
Power section of the System Specifications on page 10 for more information.
GPSMAP 400/500 Series Installation Instructions
Connecting the Wiring Harness to a Garmin CANet Device
If your GPSMAP 400/500 series chartplotter is Garmin CANet-compatible, it can receive sonar information from a CANet-compatible Garmin
Sounder or Fishfinder device. See the chartplotter functionality matrix on page 1 to determine whether your chartplotter is CANet compatible.
Using the CANet optimizes the performance of CANet-compatible devices, allowing sonar information from a sounder or fishfinder to be
shared with up to two CANet compatible Garmin chartplotters. A standard NMEA 0183 connection only allows depth, temperature, and speed
information to be sent to a single chartplotter, whereas a CANet connection provides full sonar readings, including Ultrascroll™, so you can
view and control the same information on your compatible chartplotter(s) as you can on your compatible Garmin sounder or fishfinder.
NOTE: To use the Garmin CANet with your device, you must purchase an optional CANet Kit. Contact your Garmin dealer, or visit
Connecting the Chartplotter to a NMEA 2000 Network
If your GPSMAP 400/500 series chartplotter is NMEA 2000-compatible, you can connect it to an existing NMEA 2000 network on your boat
to share information with other connected NMEA 2000-compatible devices. If you do not have an existing NMEA 2000 network on your boat,
you will need to build one. See for more information.
NOTE: NMEA 2000-compatible GPSMAP 400/500 series chartplotters are not packaged with NMEA 2000 connectors or cables. You will need
a NMEA 2000 T-connector and drop cable to connect it to an existing NMEA 2000 network. NMEA 2000 components are available from your
local Garmin dealer or marine dealer.
NMEA 2000compatible
400/500 series
NMEA 2000
(not included)
NMEA 2000
(not included)
Drop cable
(not included)
(not included)
Existing NMEA 2000 network
Connecting a NMEA 2000-compatible GPSMAP 400/500 Series
Chartplotter to an Existing NMEA 2000 Network
To connect a NMEA 2000-compatible GPSMAP 400/500 series chartplotter to your existing NMEA 2000 network:
1. Determine an appropriate location to connect the chartplotter to your existing NMEA 2000 network.
2. Disconnect one side of a NMEA 2000 T-connector from the backbone nearest to the location where you want to connect the chartplotter.
If you need to extend the NMEA 2000 backbone, connect an appropriate NMEA 2000 backbone extension cable (not included) to the side of
the T-connector you disconnected.
3. Add a T-connector (not included) to the NMEA 2000 backbone.
4. Route a NMEA 2000 drop cable from the chartplotter to the top of the T-connector you added to your NMEA 2000 network.
You can use a drop cable up to 20 ft. (6 m). If more cable is needed, add an extension to your NMEA 2000 backbone, based on the
NMEA 2000 guidelines.
GPSMAP 400/500 Series Installation Instructions
Connecting Cables to the Chartplotter
Use the diagrams below to help identify the connectors on the back of your GPSMAP 400/500 series chartplotter. Every possible chartplotter
configuration is not represented in the diagrams, but every possible connector type is listed for identification purposes. Every connector on the
back of the chartplotter may not be used for all installations.
GPSMAP 421, 441, and 451
GPSMAP 430x and 440x
➊ Wiring harness
➋ NMEA 2000
➌ External GPS
antenna (sold
➍Compatible XM
antenna with
audio adapter
(sold separately)
➎Compatible XM
GPSMAP 420, 430, 431, 440, and 450
GPSMAP 530, 535, 540, and 545
antenna (sold
➋ ➊
GPSMAP 521, 541, 551
GPSMAP 526, 536, 546, and 556
Testing the Installation
To turn on your chartplotter for the first time, press and hold the POWER key until the chartplotter beeps and turns on. Using the ROCKER
and the SELECT keys, follow the screens to configure your chartplotter.
Testing the Optional Transducer Installation
Because water is necessary to carry the sonar signal from the sounder, the transducer must be in the water to work properly. You cannot get a
depth or distance reading when the transducer is out of the water.
When you place your boat in the water, check for leaks around any screw holes that were added below the water line. Do not leave your boat in
the water for an extended period of time without checking for leaks.
GPSMAP 400/500 Series Installation Instructions
To test the transom mount transducer installation:
1. Begin testing the installation at a slow speed. If the sonar appears to be working properly, gradually increase the speed of the boat while
observing the operation of the sonar. If the sonar signal suddenly is lost or the bottom return is severely degraded, note the speed at which
this occurs.
2. Return the boat to the speed at which the signal was lost. Make moderate turns in both directions to see if the signal improves.
3. If the signal strength improves while turning, adjust the transducer so that it extends another 1/8 in. below the transom of the boat. It might
take several adjustments to eliminate the degradation.
4. If the signal does not improve, you might have to move the transducer to a different location.
Caution: When adjusting the depth of the transducer, make the adjustments in small increments. Placing the transducer too deep can adversely affect
the performance of the boat and put the transducer at greater risk of striking underwater objects.
Physical Specifications
Size : 400 Series: W × H × D: 5.7 × 5.0 . × 3.0 in.
(14.5 × 12.7 × 7.6 cm)
500 Series: W × H × D: 5.9 × 6.4 × 2.9 in.
(15.0 × 16.3 × 7.4 cm)
Weight: 400 Series: 1.30 lb. (560 g)
500 Series: 1.75 lb. (800 g)
Display: GPSMAP 420/421/430/431/440/441/450/451 (s): 4.0 in.
diagonal (10.6 cm), QVGA display with adjustable brightness,
320 × 240 pixels.
GPSMAP 520/521/530/531/540/541/550/551 (s): 5.0 in.
diagonal (12.7 cm), QVGA display with adjustable brightness,
320 × 234 pixels.
GPSMAP 525/526/535/536/545/546/555/556 (s): 5.0 in.
diagonal (12.7 cm), Full VGA display with adjustable brightness,
640 × 480 pixels, capable of 4,096 colors.
Case: Fully gasketed, high-impact plastic alloy, waterproof to
IEC 529 IPX7 standards.
Temp. Range: From 5ºF to 131ºF (from -15ºC to 55ºC)
Compass-Safe Distances:
Model Number
GPSMAP 526/536/546/556
20 in. (50 cm)
GPSMAP 421/431/441/451
26 in. (65) cm
GPSMAP 521/531/541/551
30 in. (75 cm)
GPSMAP 420/430/440/450
GPSMAP 520/530/540/550/525/535/545/555
38 in. (95 cm)
GPSMAP 420/430/440/450 (s)
GPSMAP 520/530/540/550/525/535/545/555 (s):
Differential-ready 12 parallel channel WAAS-capable receiver
GPSMAP 421/431/441/451 (s)
GPSMAP 521/531/541/551 (s):
High-sensitivity 14 parallel channel WAAS-capable receiver.
GPSMAP 526/536/546/556 (s):
High-sensitivity 12 parallel channel WAAS-capable receiver.
10 Acquisition Times: (Average acquisition times for a stationary
receiver with a clear view of the sky.)
GPSMAP 420/430/440/450 (s)
GPSMAP 520/530/540/550/525/535/545/555 (s):
Warm*: Approximately 15 seconds
Cold**: Approximately 45 seconds
GPSMAP 421/431/441/451 (s)
GPSMAP 521/526/531/536/541/546/551/556 (s):
Warm*: Approximately 1 second
Cold**: Approximately 38 seconds
*Warm: your unit is at or near the last location where you
recently acquired satellites.
**Cold: your unit has moved by more than about 500 mi.
(800 km) since it was turned off.
Update Rate: 1/second, continuous
GPS Accuracy:
Position: <49 ft. (15 m), 95% typical
Velocity: 0.164 ft./sec 0.05 m/sec steady state
WAAS Accuracy:
Position: <10 ft. (3 m), 95% typical
Velocity: 0.05 m/sec steady state
Dynamics: 6 g
Power Source: 10–32 Vdc
GPSMAP 421/431/441/451 (s)
GPSMAP 521/531/541/551/526/536/546/556 (s)
Power Source: 10–35 Vdc
GPSMAP 420/430/440/450 (s)
GPSMAP 520/530/540/550/525/535/545/555 (s)
Usage: 15 W max at 13.8 Vdc
Fuse: AGC/3AG - 3.0 A
GPSMAP 400/500 Series Installation Instructions
Power: 1 kW Transducer, 1,000 W (RMS),
8,000 W (peak to peak); (1 kW transducers are supported by the
GPSMAP 525s/526s/535s/536s/545s/546s/555s/556s units only.)
Dual Frequency, 500 W (RMS), 4,000 W (peak to peak);
Dual Beam, 400 W (RMS), 3,200 W (peak to peak)
Frequency: 50/200 kHz (dual frequency and 1 kW), 80/200 kHz (dual
Depth: 2,500 ft. (762 m) (1 kW), 1,500 ft (457 m) (dual frequency),
900 ft (274 m) (dual beam) - Depth capacity is dependent on
water salinity, bottom type, and other water conditions.
NMEA 2000 PGN Information (Only Applicable to NMEA 2000-Compatible Chartplotters):
ISO Acknowledgment
ISO Acknowledgment
ISO Request
ISO Request
ISO Address Claim
ISO Address Claim
NMEA - Command/Request/Acknowledge Group Function
NMEA - Command/Request/Acknowledge Group Function
Transmit/Receive PGN List Group Function
Transmit/Receive PGN List Group Function
Product Information
Product Information
Vessel Heading
Water Depth
Engine Parameters - Rapid Update
Speed - Water Referenced
Engine Parameters - Dynamic
Water Depth
Fluid Level
Position, Rapid Update
Speed - Water Referenced
COG/SOG Rapid Update
Water Depth
GNSS - Position Data
AIS Class A Position Report
Cross Track Error
AIS Class B Position Report
Navigation Data
AIS Class B Extended Position Report
Navigation - Route/WP information
AIS Class A Static and Voyage Related Data
Radio Frequency/Mode/Power
GNSS Sats in View
DSC Call Information
Wind Data
Wind Data
Environmental Parameters
Environmental Parameters (Obsolete)
Actual Pressure
Compatible GPSMAP 400/500 series chartplotters
are NMEA 2000 certified.
NMEA 0183, Version 3.01 Sentences: SDDBT, SDDPT, SDMTW, SDVHW, SDWPL
You can purchase complete information about National Marine Electronics Association (NMEA) format and sentences from:
Seven Riggs Avenue
Severna Park, MD 21146 USA
GPSMAP 400/500 Series Installation Instructions
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Information in this document is subject to change without notice. Garmin reserves the right to change or improve its products and to make changes in the content without
obligation to notify any person or organization of such changes or improvements. Visit the Garmin Web site ( for current updates and supplemental
information concerning the use and operation of this and other Garmin products.
Garmin®, the Garmin logo, GPSMAP®, and AutoLocate® are trademarks of Garmin Ltd. or its subsidiaries, registered in the USA and other countries. GXM™, HotFix™ and
Ultrascroll™ are trademarks of Garmin Ltd. or its subsidiaries. These trademarks may not be used without the express permission of Garmin.
NMEA 2000® and the NMEA 2000 logo are registered trademarks of the National Maritime Electronics Association.
For the latest free software updates (excluding map data) throughout the life of your
Garmin products, visit the Garmin Web site at
© 2009 Garmin Ltd. or its subsidiaries
Garmin International, Inc.
1200 East 151st Street, Olathe, Kansas 66062, USA
Garmin (Europe) Ltd.
Liberty House, Hounsdown Business Park, Southampton, Hampshire, SO40 9LR UK
Garmin Corporation
No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan
September 2009
Part Number 190-01074-02 Rev. B
Printed in Taiwan
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