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by 0 ''y'' value you mean the keel of ship ?
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No. The "0" on the y axis is the "start" position, If it was the keel it would have a "negative" value. In the case of the Bismarck it is -1.03
As far as your "moving" ship test, your basically using an old surveyor's trick of moving the
"level rod" back and forth as he looks through the "level", When the level rod reaches its lowest point that will be the "height" above the ground.
However the procedures I have outline are accurate for determining "mast height"