at least the positive floatatin should work :)
I watched a boat sink this summer. I had a slip on Yarrow Bay on Lake
Washington and there were boats at anchor out on the bay. One was a
powerboat with no top on it. Of course the rains would come and fill it up
with water. If he had a bilge pump i'm sure the battery died quickly. One
day I was working on my boat. As I peered out over the bay, there was a rare
strong northerly (bad weather in seattle is usually southerly) and I just
watched the waves sink the boat. It was really weird. Another guy at the
dock said that particular boat sinks several times per year! I saw a
catamaran partially sink too when it left a hatch open. But Yarrow bay is
real shallow so its easy to raise 'em :)
The worst I ever had was my cockpit drain plugged once and I had about of
foot of water in the cockpit.