6-1
6 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
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BAD ALMANAC means the GPS receiver's information concerning satellite positions is out of date.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 04 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.
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