Is there any way to determine 'real' displacement as a practical matter
for a typical sailor, other than loading the boat per it's intended use,
and seeing what happens ? :-)

Easiest way I can think of is to ask the crane operator the next time
you get your boat hauled out. Boat cranes often have a load cell so can
tell what the weight of your boat is and avoid overloading their crane.
May not be very accurate though.

Paul

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