When positioned between your open array and the mounting surface, this Seaview Base Wedge angles your radar down 4° to compensate for deck angle or the planing attitude of your boat. Constructed from marine-grade King StarBoard polymer, the wedge is designed to fit all Raymarine open array radars. Pre-drilled to fit your specific radar, allowing for quick and easy hassle-free installation. Model#: RW4-4. Compensates for deck angle or planing attitude Marine-grade King StarBoard polymer construction Fits all Raymarine open array radars | 4° Wedge for Raymarine Open Arrays