The Marathon Pilot's Navigator Sapphire Crystal is a highly accurate watch built to strict military specifications under MIL-PRF-46374G. Designed for pilots, parachutists, and law enforcement, the Military Navigator Pilot's Quartz is made to withstand the many challenges that are faced in a professional or everyday environment.

First developed by Marathon Watch Company in 1986, the Marathon Pilot's Navigator Sapphire Crystal was made as a request by the Kelley Air Force Base. They wanted a watch which could be used at high altitude, withstand extreme changes in pressure and altitude, as well as be an easy to read timepiece for a pilot. 

The Marathon Pilot's Navigator Sapphire Crystal is made from a specialised fibre shell case that is sweat and shock resistant, as well as lightweight. Included is a 20 millimetre nylon strap made under MIL-S-46383B, Type III. 

This version has a Sapphire crystal, gunmetal coloured crown and a battery changing compartment on the rear of the face. 

Available both with or without US Government markings. The "NGM" denotes "No Government Markings".