Personally I dont have locks. At remote fishing locations where I leave the boat in the marina, I remove my downriggers and electronics for the night. The couple of times I didn't, I couldn't sleep. By taking all of my gear off I find I can sleep at night.

I have had a few friends robbed while they were sleeping on the boat.
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Join the Puget Sound Anglers Sno-King Chapter. Meets second Thursday of every month at the SCS Center, 220 Railroad Ave. Edmonds, WA 98020 at 6:30pm Two buildings south of the Edmonds Ferry on the beach.