Chapter 11
GPS status
In the main menu the NAV provides a detailed view of the
GPS
status,the current
position dilution
of precision
(pdop) value ,and the current
GPS
coordinates of the pilot.
Figure 11.1: Satellite status
Figure
11.1
illustrates the
GPS
satellite reception page. In this example the NAV shows that 8
satellites are visible, and all 8 are being used to provide the position fix. Each bar shows the signal
strength for each individual satellite. A filled bar indicates the NAV has a
lock
on that satellite.
The
position dilution of precision
(pdop) shown gives an indication of how reliable the
GPS
altitude
is at the moment. The lower the pdop value the more accurate the position fix. Values bellow 2.5
are fairly accurate. If the NAV is switched on in a location where no satellites are visible (indoors
for example) it will go into wide search mode. If this occurs, going outdoors again will make the
NAV take an increased amount of time to pick up satellite signals. If this occurs pushing ?enter? on
the
GPS
menu item will reveal the
Reset GPS
option, changing it to yes will make the NAV reset
the
GPS
status and start a new search. So if you notice NAV is taking abnormally long to get a
fix (over 2 minutes) a
gps reset
will probably get it locked quicker (see Figure
11.1
).
41
Summary of Contents for NAV
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