Stainless GPS Mount 3″ Mounting Base 1-1.25″ Rail Edson’s Stainless GPS Arm puts your hand-held GPS securely and conveniently within reach on your Steering Pedestal Guard. The Arm is constructed of highly polished, investment-cast 316 Stainless and the mounting base is made of black, maintenance-free marine-grade polymer. Pre-drilled to fit the Garmin GPS Swivel Mount, the Arm will also accept most other round GPS brackets up to 5″ (12.7 cm) including Magellan and other Garmin units. The Edson GPS Arm is designed to attach to all 1″, 1-1/8″ and 1-1/4″ pedestal guard tubes by clamping the two pieces together around the guard tube without the need for removal of the tubes or any existing wiring.