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Receiver Status
Receiver status is indicated at the top left of the
screen, with the current horizontal accuracy (estimated
position error, in feet or meters) at the top right. The sta-
tus will show one of the following conditions:
Searching— the GPSCOM 170 is looking for any
available satellites in view.
AutoLocate— the GPSCOM 170 is initializing and
collecting new almanac data. This process can take 3
to 5 minutes.
Acquiring— the receiver is collecting data from
available satellites, but has not collected enough data
to calculate a 2D fix.
2D Navigation— at least three satellites with good
geometry have been locked onto and a 2-dimension-
al position fix (latitude and longitude) is being calcu-
lated. ‘2D Diff’ will appear when you are receiving
DGPS corrections in 2D mode.
3D Navigation— at least four satellites with good
geometry have been locked onto, and your position is
now being calculated in latitude, longitude and alti-
tude. ‘3D Diff’ will appear when you are receiving
DGPS corrections in 3D mode.
Poor GPS Coverage— the receiver is no longer
tracking enough satellites for a 2D or 3D fix.
Not Usable— the receiver is unusable, possibly due
to incorrect initialization or abnormal satellite condi-
tions. Turn the unit off and back on to reset.
Simulator— the receiver is in simulator mode.
EZinit Prompt
The satellite status page also provides access to the
EZinit prompt whenever a position fix has not been cal-
culated (the unit must be in searching, AutoLocate,
acquiring, simulator or poor coverage mode). This allows
you to manually reinitialize the unit (see Appendix A for
instructions), and is useful if you have travelled over 500
miles with the receiver off and you know it must be ini-
tialized to your new position. The GPSCOM 170 will
automatically offer the EZinit prompt after 10 minutes of
unsuccessful satellite acquisition.
If you travel more than 500
miles with the receiver off,
you may have to reinitialize
it to your new location. To
access the EZinit prompt,
press ENTER from the sta-
tus page before the receiver
has acquired any satellites.
Receiver Status
Reference
19
A ‘Poor Coverage’ status
will appear if the receiver
has lost the satellites
required to compute a fix.
Make sure the internal
antenna is not covered and
has a clear view of the sky.
170 manual pages rev D 9/21/98 9:23 AM Page 19