High Quality Content by WIKIPEDIA articles! The Martin P5M Marlin (P-5 Marlin after 1962), built by the Glenn L. Martin Company of Middle River, Maryland, was a twin-engined piston-powered flying boat entering service in 1951 and serving into late 1960s in service with the United States Navy for naval patrol. It also served in the U.S. Coast Guard and with the French Navy. 285 were produced overall.