BOTH INTERNATIONAL & INLAND In fog you observe your radar and determine that risk of collision exists with a vessel which is 2 miles off your port bow. You should __________.

Correct Answer: Option D — take avoiding action as soon as possible

Rule 19(d) requires taking avoiding action in ample time when a risk of collision exists in restricted visibility. Holding course and speed or delaying action violates good seamanship and COLREGS when a close-quarters situation is developing on radar at two miles.