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Originally Posted by Tigrone
It's measured in how far your keel is below the surface. There is so much topside variation from boat to boat that there is really no universal fixed point to use there. The keel is an absolute reference point.
Depth is measured from the keel down in the same way--depth below keel.
Almost forgot, that is one of 2 depth gauges. There is a second showing depths in a broader scale to 450' or 600' depending on the class of boat.
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You mean you've seen shots of dials with imperial measurement? Where?