Nav key – Garmin GNC 300XL TSO User Manual
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21
SECTION
1
NAV KEY
Satellite
Status Page
Satellite status page with ‘DOP’ displayed.
Dilution of Precision (DOP) measures relative
accuracy from 1 to 10.
The top lines of the status page display active and standby frequencies, followed by
the receiver status and the current position accuracy in DOP or EPE. The default setting
is DOP. The following functions may be displayed in the DOP/EPE field:
• dop— Dilution of Precision, a measure of the satellite geometry quality and
relative accuracy of your position, with 1 indicating good geometry
and 10 indicating poor.
• epe— Estimated Position Error, an overall measure of your positional accu-
racy in feet or meters using signal and data quality, receiver tracking
status and DOP.
To change the DOP/EPE field:
1. Press
N
and rotate
O
to display the satellite status page.
2. If the desired field (EPE or DOP) is not displayed, press
C
twice.
3. Use
K
to change between ‘epe’ and ‘dop’. Press
C
to finish.
The receiver status field, located at the top left of the page, will display the follow-
ing messages under the appropriate conditions:
Search Sky - The GNC 300XL is searching the sky for visible satellites. You
will be informed with the message ‘Searching the Sky’.
Acquiring - The GNC 300XL is acquiring satellites for navigation.
2D Nav - The GNC 300XL is in 2D navigation mode. If your installation
does not include an altitude serializer, you must enter the alti-
tude manually (see page 2). ‘2D Dif Nav’ will appear when you
are receiving DGPS corrections in 2D mode.
3D Nav - The GNC 300XL is in 3D navigation mode and will compute
altitude. ‘3D Dif Nav’ will appear when you are receiving DGPS
corrections in 3D mode.
Simulator - The GNC 300XL is in simulator mode, which should only be
used for practice and trip planning. Never use simulator mode
for actual navigation.
‘Acquiring’ satellites for navigation. In this case,
the satellites are being received, but the data is
still being collected before a position can be
determined.
300xl manual 1/25/99 2:35 PM Page 21