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Simply speaking, the design draft of a ship is what the designers consider will be the median hull draft between high and low loads.
Navigational draft is calculated from what the ship's HULL draft is and adding anything sticking out below it such as a SONAR dome, unretracted manuevering propellers (such as on FFG-7 ships), a Pitometer sword that refuses to be cranked back up, etc.
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Able to leap tall tales in a single groan.
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