For mariners looking for a sleeker installation of the GPSMAP 620 or 640 at their helm, this flush mount kit is the answer. Users easily can flush mount their GPSMAP 620 or 640 to most flat surfaces such as a bulkhead or cabin wall. It features a tilt-n-lock fastening mechanism to firmly hold the unit in place while on the water. The unit even can be securely locked into the flush mount with the included security screw tool. With the simple touch of a button, the unit easily pops out of the mount for transport or storage.