- Calculate radius of the turn by the formula

**Radius = average speed/ROT x 0.96**

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

course line.

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

the curve.

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