RT_GPS_Turn_Radius GPS Turn Radius
RT_GPS_Turn_Radius: 140, 23 (0x8C1720 + unit id) (0x317)
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Byte 0: Validity
Byte 1: Accuracy
Bytes 2-5: GPS Turn Radius [m]
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Resolution of turn radius is m/1000
Turn radius is positive when turning right, negative when turning left