RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass
HGPS-6
3.0 DETAILED OPERATION
With the HGPS compass option properly installed, the operation of the RC3000 will be almost exactly as
described in the baseline user's manual with just a few exceptions noted below.
3.2.2.3 LOCATE mode
Upon entering LOCATE mode, the RC3000 will try to automatically obtain latitude, longitude and heading
as described in the baseline manual. Since the GPS compass provides true heading there is no need for
the RC3000 to calculate an estimate of the local magnetic variation. A flashing "MAGVAR" will therefore
not appear after the lat/lon has been obtained and the system clock has been synchronized to GPS time.
3.3.2 Maintenance Items
Items 6, 7 and 9 of the MAINTENANCE mode are different reflecting the use of the GPS compass
engine.
1-VOLTS 2-DRIVE RESET MAINTENANCE
3-TIME 4-AGC ADJ 5-LIMITS 6-GPS COM
7-CSI HDG 8-AZEL 9-CSI CAL 0-SHAKE
<0-9>SELECT <MODE>CONFIG S1-GTRv1.46
3.3.2.6 GPS Serial Port Diagnostics
As described in the baseline manual, this screen will reflect the raw data being received from the GPS
unit. The data seen will be slightly different from that described in the baseline manual:
- no $PGRMT sentence will be present as this is a proprietary message from the Garmin GPS
- the $GPRMC sentence should still appear at a 1 hz. rate but will contain additional characters for time,
latitude and longitude. The following is an example $GPRMC message from the HGPS unit:
$GPRMC,133544,V,3856.0856,N,09444.8377, W,000.0,000.0,080499,003.6,E*7B
Also compared to the Garmin unit, when the CSI is reporting that no current navigation solution is
available ("V" in the sentence vs. "A"), no data will be displayed between the comma delimiters. In this
case the sentence will appear something like:
$GPRMC,,V,,,, ,,,,,*66
- the $GPGGA will appear at a 0.2 hz rate vs. 1 hz for the Garmin unit.
- additionally the $GPHDT sentence supplying the GPS engine's estimate of true heading will be provided
at a 1 hz. rate. This sentence will typically not appear until a valid navigation (lat/lon) solution has been
achieved by the GPS engine. The following is an example sentence:
$GPHDT,123.4,T*5A
As with the $GPRMC and $GPGGA sentences, if no valid true heading is currently being derived, the
sentence will show no data between the comma delimiters ($GPHDT,,,*4C).
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