P5M-1 Marlin US NavyMartin P5M Marlin airplane model, by the Glenn L. Martin Company of Middle River, Maryland, was the last flying boat in service with the United States Navy and the US armed forces in general. Built as a successor to the PBM Mariner, the new hull form and new conventional tail were fitted to a Mariner to become the XP5M Marlin prototype. The Marlin was designed as a gull winged aircraft to lift the engines and propellers high above the spray. Power was