HDG sentence incorrectly parsed

[tvr256]

As mentioned in SignalK/specification#242 (comment) , the HDG sentence is incorrectly parsed:

If I send the following sentence $INHDG,180,5,W,10,W*6D

navigation.magneticDeviation is not set (should be -5)
navigation.magneticVariation is set to -10 (correct)
navigation.headingCompass is not set (should be 180)
navigation.headingMagnetic is set to 180 (should be 175)
navigation.headingTrue is not set (should be 165)

Incidentally, the NMEA spec clearly states that the first value in the HDG sentence is the magnetic sensor reading before any deviation correction is applied, and not the magnetic heading.

[tkurki]

Thanks for the heads up. Please check out the linked PR for the fix.