You don''t state the value of the boat but if it is low you might consider self insuring
(eat the cost if it''s a total loss) This makes sense if you do the math in some cases.
It would be wise, and sometimes required by marinas, to carry liability insurance. I just purchased a liability policy for a 31'' sailboat for $70 per annum through State Farm. My formula is that if it costs 20% or more of the value of the boat per annum I don''t generally want insurance other than liability. Be sure to factor deductables and exclusions into your calcs as these costs can make the difference. Also take into account the survey cost if the only reason you get a survey is for insurance purposes. p.s. don''t expect to go to weather very well in that boat.