BendixKing SKYMAP IIIC - Manual (Page 48)

DETAILED OPERATION
GPS STATUS SCREENS (SKYMAP IIIC ONLY)
Screen 3: GPS Status Screen
Pressing Key 1, GPS STATUS, in Main Menu, accesses this Screen.
The GPS Status Screen will display the receiver status. This can be any of the following:
BAD ALMANAC <3 SATS DIFFERENTIAL ACQUIRING
2D FIX 3D FIX POOR DOP POS PROP
D
E
T
A
IL
E
D
O
P
E
R
A
T
IO
N
The meanings of these displays are:
BAD ALMANAC means the GPS receiver's information concerning satellite positions is
out of date. If this occurs the unit should be left alone with the antenna connected and in
view of the sky for approximately 15 minutes during which period it will automatically lock
onto a satellite and load an up-to-date almanac.
<3 SATS means that according to the current information available, there are less than
three satellites in view and a fix can not be calculated. This message is very rarely
displayed.
DIFFERENTIAL This word will be displayed in conjunction with 2D FIX or 3D FIX and
means that the Skymap IIIC has a fix and is also receiving differential correction signals
from an external source. (Refer to APPENDIX E for further details concerning differential
operation.)
ACQUIRING means the unit is currently searching for satellites or is loading information
from one or more satellites.
2D FIX means the unit is calculating position in two dimensions (i.e. latitude and longitude
only, with no height information).
3D FIX means that the unit is calculating position in three dimensions and can give
latitude, longitude and height information.
POOR DOP means that the unit is unable to calculate position owing to the poor geometry
of the visible satellites. (DOP stands for Dilution of Precision.)
POS PROP means that navigation has been temporarily lost and the Skymap IIIC is dead-
reckoning (or propagating) its position based on the last known position, track and ground
speed. It will not dead-reckon for more than a few seconds at a time.
Rev 9 Jul 2006 3-5 Skymap/Tracker IIIC Pilot's Guide