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Chapter 4: Commissioning the system 37
This screen provides, for each tracked satellite, the satellite number, a graphical signal
strength bar, status, azimuth angle and its elevation angle from your vessel. The sky
view graphic shows the position of these satellites.
Positional accuracy is dependent upon these parameters; in particular, the azimuth
and elevation angles are used in a triangulation process to calculate your position.
Horizontal Dilution of Position (HDOP) is a measure of this accuracy; a higher figure
signifies a greater positional error. In ideal circumstances, the figure should be in the
region of 1.0.
When a connection has been successfully made, the GPS status icon in
the top right-hand corner of the screen reads FIX.
If NO FIX is displayed, please refer to the Troubleshooting section on
page 41
.
The option to select differential or satellite differential fix is dependent
upon the capabilities of the attached GPS. If your boat is equipped with a Raymarine
GPS, the Differential GPS can be switched on or off using the appropriate soft key.
4.7 How do I check the heading data?
If your display is connected to a compass, autopilot or fast heading sensor, your boat’s
heading will be displayed in the data bar. If heading data is not available your display
can use COG data. This will however affect the operation of the following functions:
• overlay a radar image over your chart.
• orientate a radar image north-up.
•MARPA.
To linearize (‘swing’) your compass proceed as follows:
1. Press MENU.
2. Select the Compass Setup sub-menu.
3. Press LINEARIZE COMPASS and follow the instructions displayed on screen. When
instructed to align heading, press the ALIGN HEADING soft key and then turn the
rotary control one click at a time to fine tune the heading.
4.8 How do I check the Chart application?
For full functionality of chart applications, you need to ensure that position data is
available at the display via SeaTalk, NMEA, SeaTalk
2
or SeaTalk High Speed. To use
your chart as a navigation aid you will need a CompactFlash card (see
page 10
) with
the appropriate level of detail for the geographic area that you wish to navigate.
Proceed as follows:
D7453_1