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This would be a cause for concern - like sailing a navigation with bridgescut
a foot or so higher than the mast - or even more interesting: a navigation
with bridges several feet LOWER than one's mast. I saw an interesting
demo of how to do this: haul up big water bladders to a suitable height,
then motor in a shallow curve to roll the hull, setting the bladders back
onto the water surface, at which point a low bridge is navigable.
Brian W