2.4 How to Select the Chart Scale. Furuno FMD-3200-BB, FMD-3200, FMD-3300

Furuno FMD-3200-BB is an advanced electronic chart display and information system (ECDIS) designed to provide mariners with precise navigational information and enhance situational awareness. Its user-friendly interface, combined with powerful processing capabilities and comprehensive features, makes it an indispensable tool for professional mariners.

PDF

Document

2. OPERATIONAL OVERVIEW

2.10 Datum

2.10.1

General

Datum is a mathematical model of the earth based on which a sea chart is produced.

If the datum of a position sensor and that of a sea chart are different, a transformation has to be made somewhere in the system. Not doing so can result in errors of several sea miles. The difference between two datum is never constant, but depends on position. This means that the difference between WGS-84 and local datum, generally used in paper charts, is not generally valid with electronic sea charts.

2.10.2

Paper charts

Datum used in paper charts have been traditionally national datum for historical reasons. Many paper charts do not have a marked datum, therefore compatibility with electronic charts may be complicated. In some paper charts, the correction terms are printed in lieu of datum, for correction of the WGS-84 system satellite locations. The correction terms are usable but only with the paper chart in question.

2.10.3

Electronic sea charts

• The ENC vector material has to be produced by a National Hydrographic Office in the WGS-84 datum.

• The ARCS (raster) material includes polynomials for each chart, making it possible for the ECS system to solve the difference between the WGS-84 datum and the local datum with an accuracy sufficient for authority responsibility. In some charts, the mentioned difference is not known with sufficient accuracy, resulting in displaying a message in the Cursor position box when displayed in ARCS compatible systems.

2.10.4

Positioning devices and datum

In early days of electronic positioning devices, datum received little attention because the commonly used systems utilized special charts (like Decca charts). Later on, data output was added to these systems, but still no attention was paid to datum and the position errors were considered as an inaccuracy of the system. With the spread of the GPS, however, datum has become better known. An accurate position is of no value if co-ordinates are in a wrong datum. GPS satellites utilize the WGS-84 datum.

2.10.5

ECDIS and datum

The ECDIS uses ENC material, produced to standards using WGS-84 datum. Positioning devices connected to the ECDIS must work in the WGS-84 datum. IMO requires that the ECDIS must give an alert if the datum of a positioning device is not the

WGS-84.

2-23

Key features

Simplified user interface
High-resolution display for clear chart viewing
Dual-chart display capability
Route planning and monitoring tools
AIS target tracking and display
Radar overlay for enhanced situational awareness
USB connectivity for external data transfer

Frequently asked questions

To turn on the FMD-3200-BB, simply press the power button located on the front panel of the unit.

The standby mode allows the unit to remain in a low-power state while still maintaining critical functions such as GPS tracking and alarm monitoring.

To select a color palette, press the 'Color' button on the RCU-024 control unit and use the arrow keys to navigate through the available options.

User questions

John X.

How is the size of the Look-ahead area set, which the ECDIS uses to scan ENCs for problems along the ship's course line?

Select the [Check Area] page from the [Overlay/NAV Tools] box and set the ahead time or distance and ahead width, as well as the "Around" figures, which include port, starboard, bow, and stern check distances. The reference point for this setup is the conning position (CCRP).

John X.

Where is the Safety Contour set for the route plan check, which is performed by the route planning tool?

Enter the desired safety contour, plan a route by defining waypoints, choose dangerous objects to be monitored during route monitoring on the [Alert Parameters] page in the [Route Plan] dialog box, and click the [Check Route] button to generate a list of chart alerts based on the safety contour and other parameters.

John X.

How are navigational chart objects manually added to the FURUNO ECDIS when required by information received via VHF broadcast?

Enter the user chart creation feature on the ECDIS, input the necessary objects and text, and follow the specific instructions to add different types of objects like Tide, Circle, Current, Label, Area, Line, and Text to the user chart.

Linda V.

How to activate the Four Shades function for ENCs on the Furuno FMD 3200?

To activate the Four Shades function for the ENCs on the Furuno FMD 3200, access the context-sensitive menu by right-clicking any VRM or EBL box. From there, you can find additional functions for EBLs and VRMs, including the option to center the origin of the EBL and VRM on the current position using the 'Centered' function.