Messages for use with a compass.
Azimuth message carries information about an azimuth. As there are multiple possibilities related to the azimuth meaning, it has 3 metadata fields that exactly specify the meaning of each message:
unit:UNIT_DEG: azimuth field is in degrees and variance in degrees^2UNIT_RAD: azimuth field is in radians and variance in rad^2orientationORIENTATION_ENU: The azimuth is measured in East-North-Up frame. Azimuth 0 thus points to the East and increases counter-clockwise.ORIENTATION_NED: The azimuth is measured in North-East-Down frame. Azimuth 0 thus points to the North and increases clockwise.reference: Which North reference is used.REFERENCE_MAGNETIC: Magnetic North.REFERENCE_GEOGRAPHIC: Geographic North.REFERENCE_UTM: UTM grid North.