[Function]1) securely mount and connect your chartplotter or fish finder and 2) protect them from waves and wind in rough seas with a swing arm that allows for easy and smooth adjustments and a full 360-degree rotation. [Compatibility] Compatible with: 1) for echoMAP /for ECHOMAP Plus/for ECHOMAP UHD/for ECHOMAP Ultra/for GPSMAP Plus/for Vivid/for Plus series fish finders and GPS chartplotters; 2) for /for Helix/for fish finders and GPS chartplotters; 3) for Eagle/for Elite /for HDS Carbon/for HDS LIVE/for HDS PRO/for Hook Reveal/for HOOK series fish finders and GPS chartplotters. [360 Rotation] Two pivot points on the bracket allow for 360-degree rotation: 1) One at the base of the long, curved arm allows for smooth and free adjustment; 2) Another at the center of the rectangular plate allows for different angles to view the fish finder. [Practical Design]1) Horizontal Mounting Base: Easily secure this bracket to your boat with screws; ideal for limited deck space. 2) Multiple Mounting Holes on the Rectangular Plate: Multiple holes allow for different mounting options and are strategically designed to align with the your universal joint bracket, eliminating the need for additional drilling. 3) Threaded Pin Lock Knob: Simply loosen or tighten by hand to secure or release the arm or rectangular plate. [High Quality]1) This bracket is meticulously crafted from a high-strength composite material, providing a secure and stable support for your device. 2) Powder-coated steel is waterproof and -, ensuring a long lifespan, making it an ideal solution for overseas travel. Specification:with 12 Inch Marine Swing Arm Color: Black Material: Maritime Grade Aluminum Alloy Package Contents: 1 x Fish Finder Holder Mount Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.