Stainless GPS Mount 5" Mounting Base 1-1.25" RailEdson'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, that Will also accept most GPS brackets up to 5" (12.7 cm) including Magellan and 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.