Draft Mark Correction Calculator.xls

CORRECTION OF DRAUGHTS TO PERPENDICULARS AND MIDSHIPS

LBP

FP

AP

Df DM D AP

D FP

Dm

Da

Midship AP = aft perpendicular FP = forward perpendicular LBP = length between perpendicular D AP = draught at aft perpendicular Da = draught at aft draught marks D M = draught at midships Dm = draught at midships draught marks D FP = draugfht at forward perpendicular Df = draught at forward draught marks

7.92

distance D FP to Df

0.52

distance D AP to Da

0.44

distance D M to D m

0.65

279 7.921 7.422 7.42 7.141 7.14

Forward correction = ( apparent trim x distance D FP to Df ) / distance Da to Df Aft correction = ( apparent trim x distance D AP to Da ) / distance Da to Df Midships correction = ( apparent trim x distance D M to Dm ) / distance Da to Df

0.001454 0.00123 0.001817

Where: apparent trim = difference between Da and Df

0.78

distance Da to Df

279

Source: NE P&I Club, Draught Surveys, A Guide to Good Practice, MID-C Consultancy, 1994