Definition
Every vessel must use all available means to determine if risk of collision exists, and if there is any doubt such risk is deemed to exist. Proper use must be made of operational radar, including long-range scanning and radar plotting or equivalent systematic observation. Risk is deemed to exist if the compass bearing of an approaching vessel does not appreciably change, and may exist even with an appreciable bearing change when approaching a very large vessel, a tow, or a close-range target.
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