Any recommendations about buying liability insurance for my Potter 15?
When I was thinking of getting a boat, I called my insurance agent and asked what to do. He suggested that for a boat under 26' and WITHOUT an engine, I'd be covered under homeowner's insurance. (Seemed odd, but heck, they're the insurance folks.) I would even be covered if I rented a boat from some lake or community center, gave some folks a free sailing ride, and then had some accident where one of the folks got injured.
When I got my WWP-19, I called the agent back and said, "I've got a 19-footer with a 5HP engine... now what?" And I ended up with a boater's policy from Farmers Insurance. I'm sure you could get something with Geico or some other place, but Farmer's has always worked for me. I've never had to file a boating claim, but they've helped me on several claims with the many cars I've had. Of course, YMMV.