B&G Network Autopilot - Manual (Page 11)

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NMEA OUTPUT
NMEA output is via the network cable connection tail, use a special 3m
NMEA output cable 610-OA-030 (Red sig+, Blue sig-).
Dependent on system devices, the following sentences are transmitted:
$IIHDM
Heading
$IIVHW Speed and heading
$IIDBT Depth below transducer
$IIVWR Apparent wind angle and speed
$IIMTW Water temperature