Course Indicator MN-97 Omni-Mag (ID-249/ARN)

This Cold War / Vietnam War era Course Indicator MN-97 Omi-Mag was made by Bendix for use in aircraft of the US military and commercial carriers. In military applications of the 1950/60's this was known as the ID-249A/ARN or ID-249/ARN as used in the AN/ARN-14 Radio Navigational System (see illustrations).  It also was used in the USAF strategic bomber B-52 and the jet fighter F-100 Super Sabre (see illustrations). According to Flight Magazine dated 1957, The MN-97 O.M.I. is a combination instrument embodying the functions of an omni-bearing selector, a flight path deviation indicator, an ambiguity indicator, and a relative magnetic heading stabilizer. The RMI requires an additional source of gyro-stabilized magnetic heading information.  The presentation includes a to-from window with sense indication displayed when the aircraft is on or near the selected radial and a vertical pointer for all navigational services. The pointer maintains its center position as long as the aircraft is o