Actually, Rich, with all due respect, what COLREGS says that "Every vessel shall at all times maintain a proper look-out by sight as well as by hearing as well as by all available means appropriate in the prevailing circumstances and conditions so as to make a full appraisal of the situation and of the risk of collision."
This is often misconstrued to mean that if you have
radar it must be on. It really means that Radad only must be employed when the conditions are such that failure to so creates a hazzard.
Respectfully,
Jeff