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Mean / True Mean Draft

Mean draft and UNCTAD 'mean of means' draft at the LCF - the reference every draft-survey starts with.

StabilityDraft survey

Draft marks

Forward draftmAft draftmMidships draftmRead from both port and starboard and average.

Geometry

LCF distance from APmFrom hydrostatic tables at the current mean draft.Length between perpendicularsm

Mean draft (F + A)/2

6.800m

Mean of means (F + A + 6M)/8

6.815m

Corrects for hog/sag.

True mean at LCF

6.800m

Trim

0.600m

By the stern

Formula, assumptions, and limits

UNCTAD 1991 draft survey uses T_LCF as the hydrostatic-entry draft (not the simple mean), then applies trim + density corrections to the displacement.