I asked a mate when I was down there a few years ago. He said they have to raise them, or they would be replacing lower units and thru hulls weekly.
80 degree salt water is an order of magnitude more corrosive than the NE water, and the growth is viscious.
So I guess its just a matter of $$$$$$$$$$.
For the ~6 mos of boating (3 months this year LOL) it just isn't worth it......
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