33 CFR §83.11

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A vessel restricted in her ability to maneuver is at anchor in restricted visibility. Under Inland Rule 35, she is sounding one prolonged blast followed by two short blasts at intervals of not more than 2 minutes. A nearby power-driven vessel making way hears this signal. Which Rule imposes the obligation on the power-driven vessel to use that auditory information as part of its look-out?

1. A.Inland Rule 18, because a power-driven vessel must keep out of the way of a vessel restricted in her ability to maneuver
2. B.Inland Rule 11, because vessels must be in sight of one another before the steering and sailing rules apply
3. C.Inland Rule 5, because every vessel must maintain a proper look-out by sight and hearing as well as by all available means
4. D.Inland Rule 35, because the fog signal itself constitutes the required look-out for the anchored vessel