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OBSERVATOR
Instruments
Technical User Manual
OMC-045-II
7.5 GPS
Errors
Open a COM port by using the Terminal window of OMC-Programmer. As soon you open the port, the
NMEA messages should be visible. Keep in mind that the GPS antenna should have enough signals. Put
the antenna preferably outside or near the glass of a window.
Sample messages:
$GPGSA,A,3,08,25,19,27,,,,,,,,,4.4,4.2,1.0*37
$GPGSV,3,1,12,19,53,290,37,27,13,299,38,08,12,326,38,25,09,277,40*78
$GPGSV,3,2,12,07,86,218,,03,78,273,31,18,50,088,,15,36,064,*7E
$GPGSV,3,3,12,21,23,065,,26,12,042,,16,08,166,,10,06,034,*74
$GPRMC,083341.000,A,5152.5110,N,00437.1426,E,0.38,296.31,040308,,,A*6F
$GPGGA,083342.000,5152.5105,N,00437.1449,E,1,04,4.2,22.7,M,47.2,M,,0000*6C
When the data comes in, in the terminal, the GPS is functioning. In the GPS test screen of OMC-
Programmer, you can control if a GPS fix location can be asked. If you can’t it can mean you are having
antenna problems. In optimal conditions the GPS has a fix within 40 seconds. The $GPSGGA message is
used to get its data and time synchronization.
