- Calculate radius of the turn by the formula
where ROT and speed could be decided as per the
particular ship's maneuvering characteristics
2. Draw two arcs, one in the old course and one on the new course by
taking any arbitrary point as centre along the course line.Radius should
be the one obtained above.
3. Draw tangents to the two arcs by transferring the corresponding
4.Point of intersection of the tangents is the center from which an arc
should be drawn to cut the new and old course lines.This arc is the the
curve to follow at the given ROT and avg. speed.Radius of this arc
is the same calculated radius.
5.Vessel will take some distance to respond to the turn, which is equal
to the F factor(approx ship's length).
6.Thus to get the wheel over line, transfer the new course line to a
point on the old one which is at a distance of one ship's length from