To adjust the GyroTrac reference to match the reference of the
autopilot (or other system), connect a voltmeter to GyroTrac
ADCU terminal (#8) and the reference terminal of the autopilot
(or other system). Adjust the GyroTrac reference voltage as
described in “Setting the Sine/Cosine Data Output” on page 71, until
the voltmeter indicates 0 VDC.
The sine/cosine interface should now operate with optimal
precision.
Connecting GPS for True North Capability
(Optional)
GyroTrac is capable of determining true north that is accurate,
under most conditions, to within ±1º. This capability requires a
GPS data input to the GyroTrac
NMEA sentences from the GPS must contain one or all of the
following sentences: VTG, VHW, or BWC. The sentence structure
must comply with the NMEA 0183 V2.20 standard and run at
4800 bps 8.N.1.
As illustrated in Figure 2-27 and the GyroTrac wiring quick
reference guide on the back cover of this manual, GPS interface
cables connect to the blue ADCU terminal strip connector at
terminals 23 and 24. Refer to your GPS user manual for the
correct NMEA data out configuration.
54-0161
38
TracVision G6 Technical Manual
When the vessel is stationary,
certain GPS models may not output
the data required for GyroTrac to
determine true north.
Figure 2-27
GPS to ADCU Wiring
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