Radar Check - Raymarine gs series Installation Instructions Manual

• Horizontal Dilution of Precision (HDOP)
— HDOP is a measure of satellite navigation
accuracy, calculated from a number of factors
including satellite geometry, system errors in
the data transmission and system errors in the
receiver. A higher figure signifies a greater
positional error. A typical receiver has an accuracy
of between 5 and 15 m. As an example, assuming
a receiver error of 5 m, an HDOP of 2 would
represent an error of approximately 15 m. Please
remember that even a very low HDOP figure is
NO guarantee that your receiver is providing an
accurate position. If in doubt, check the displayed
vessel position in the Chart application against
your actual proximity to a known charted object.
• Estimated Horizontal Position Error (EHPE)
— EHPE is a measure of the estimated error of
a position fix in the horizontal plane. The value
displayed indicates that your position is within a
circle radius of the stated size 50% of the time.
• Fix status — indicates the actual mode the
receiver is reporting:
– Fix — Satellite fix has been acquired.
– No Fix — No satellite fix can be acquired.
– D Fix — A differential beacon fix has been
acquired.
– SD Fix — A differential satellite fix has been
acquired.
• Position — Displays the latitude and longitude
position of your receiver.
• Date / Time — Displays the current date and time
generated by the position fix in UTC format .
• Mode — Identifies wether the receiver is working
in differential mode or non-differential mode.
• Datum — The receiver's datum setting affects
the accuracy of the vessel position information
displayed in the Chart application. In order for your
receiver and MFD to correlate accurately with your
paper charts, they must be using the same datum.
System checks

7.3 Radar check

Warning: Radar scanner safety
Before rotating the radar scanner, ensure
all personnel are clear.
Warning: Radar transmission
safety
The radar scanner transmits
electromagnetic energy. Ensure all
personnel are clear of the scanner when
the radar is transmitting.
Checking the radar
From the Radar application:
1. Select Menu.
2. Select Power so that On is highlighted.
The Radar scanner will now initialize in standby
mode. This process will take approximately 70
seconds.
3. Select Radar so that Transmit is highlighted.
The radar scanner should now be transmitting
and receiving.
4. Check that the radar screen is operating correctly.
Typical HD radar screen
Note: The example above is representative of the
enhanced output provided by a HD radar scanner.
Points to check:
• Radar sweep with echo responses are shown
on screen.
• Radar status icon rotating in top right hand
corner of the status bar.
Check and adjust bearing alignment
Bearing alignment
The radar bearing alignment ensures that radar
objects appear at the correct bearing relative to your
boat's bow. You should check the bearing alignment
for any new installation.
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