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Initializing the GPSCOM 170 for First-Time Use
The first time you power up your new GPSCOM 170
is an important step in getting the best possible GPS per-
formance. The receiver must be given an opportunity to
collect satellite almanac data and establish its present
position. This initialization process takes approximately
3 to 5 minutes and is only necessary for first-time opera-
tion, after memory loss, or when the receiver has been
moved more than 500 miles from the last calculated posi-
tion with the power off. Once your GPSCOM 170 has
been properly initialized, you should acquire satellites
and obtain a position quickly each time you power up.
Your GPSCOM 170 is shipped in the AutoLocate
mode, which is designed to let the receiver “find itself”
without using its last known position (you don’t need to
worry about what lat/lon is currently displayed on the
position page, as the unit is not using that information to
calculate your present position).
To power up your unit for first time use:
1. Position the internal GPS antenna so it has the best pos-
sible view of the sky (the internal patch antenna is locat-
ed just above the keypad, marked by the embossed
globe).
2. Turn the unit on by rotating the volume control
clockwise.
3. Rotate the squelch control clockwise until receiver
noise disappears.
4. Remain in the same location until the GPSCOM 170 has
calculated a position. (You’ll know you have a fix when a
2D or 3D status appears in the status field or the receiv-
er automatically transitions to the position page. If you
encounter difficulty acquiring satellite signals, see
page 66.)
64
Initializing The
Receiver
APPENDIX A
Welcome Page
170 manual pages rev D 9/21/98 9:23 AM Page 64