The ONLY folks that attempt to operate at hull speed seem to be the sailors , as wind energy is free and broad reaching in 17K + with whole sails is exciting.
Most marine motorists will LRC at Sl of about 1
Thats the Sq RT of the actual underway LWL in K.
The only forced confusion is the ICW motorists that quote statute miles (that what their charts are calibrated for) .
So 6K is about 7stat , which sounds faster
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