Remote Indicating Compass Aircraft Gauge Vintage gauge from a light aircraft, manufactured by the Kollsman Instrument corporation in Elmhurst, NY. According to AricraftSystemsTech.com"Magnetic deviation is compensated for by swinging the compass and adjusting compensating magnets in the instrument housing. A better solution to deviation is to remotely locate the magnetic compass in a wing tip or vertical stabilizer where there is very little interference with the earth’s magnetic field. By using a synchro remote indicating system, the magnetic compass float assembly can act as the rotor of the synchro system. As the float mechanism rotates to align with magnetic north in the remotely located compass, a varied electric current can be produced in the transmitter. This alters the magnetic field produced by the coils of the indicator in the cockpit, and a magnetic indication relatively free from deviation is displayed. Many of these systems are of the magnesyn type. " Approximate size: 3.5" x 3.5" x 4.5" Approximate weight: 1 lb