This weatherproof MIL-REM70 wired remote works with select marine receivers, including the JBL-PRV175, INF-PRV250, JBLPRV275, and INF-PRV315. You can surface-mount or back-mount this remote, depending on your preference, but you'll need to drill a 1-1/2" hole for the wire. 

If the included 2-foot cable isn't enough and you need more wire length, the 20-foot Milennina REX20-6 extension cable will work nicely in most boats.