The most obvious advantage of the PAI-700 Vertical Card Magnetic Compass is the Easy to Steer By presentation! With a glance at the aero design lubber line on the lens, you see the complete 360 dial in proper relation to your aircraft heading, or the reciprocal thereof, presented the way you think. The PAI-700 utilizes eddy current damping, no fluid. Overswing is minimized or eliminated. Either 5Volt, 14Volt, or 28Volt light assembly is furnished. Manufactured exclusively by Precision Aviation, Inc., under authorization by the U.S.D.O.T., Federal Aviation Administration citing FAR-21 and TSO C7c Type 1.