WHEEL-OVER POSITION

ALTERATION OFCOURSE F

“F”: HEAD REACH-DISTANCE TRAVELLED BY THE VESSEL AFTER GIVING WHEEL OVER AND BEFORE COMMENCING TURN-DISTANCE TO OVERCOME INERTIA“P”: PERPENDICULAR DISTANCE FROM WHEEL OVER POINT TO NEW COURSE EXTENSION“D+P”: PARALLEL INDEX DISTANCE AT W/O POSITION“D”: PARALLEL INDEX DISTANCE FROM NEW COURSE AS OBTAINED FROM THE CHART“R”: RADIUS OF TURN“ALTERATION OF COURSE”: CHANGE OF COURSE ANGLE

TO FIND AND MARK APPROX. WHEEL OVER POSITION F = 0.10 ~ 0.15 NM P = R (1 – COS [ALTERATION OF COURSE]) + F.SIN [ALTERATION OF

COURSE] RATE OF TURN = {V/R} x0.96 WHERE V=SPEED OF THE SHIP DISTANCE TO NEW COURSE = RADIUS x TAN [ALTERATION OF

COURSE] / 2

D

P

W/O

CENTER

ALTERATION OF COURSE (*)

WHEEL OVER POINT = F + DISTANCE TO NEW COURSE