When specifying a great circle (Hotine Oblique Mercator) using a point and an azimuth (arc), the azimuth is called the Oblique Azimuth and is expressed in degrees.
Note: MapInfo Pro assumes that the Azimuth and a Rectified Skew values are identical for a Hotine Oblique Mercator. This is because the MapInfo Pro map file allows for only eight Coordsys parameters not including the Projection value. MapInfo Pro supports Alaska State Plane Zone 1, which has identical Azimuth and a Rectified Skew values.