One of the things that can happen Ive heard is that the starter gets wet. so when you turn the key you get "click" "click" might be seized from getting wet... Just a suggestion.. I guess there is a bunch of things that could affect it but if it wont even turn over I would check the starter first

Let me know how it turns out Im really curious as I have put some huge rollers over the bow of my boat but not to this extent!!

Cheers