Also this:
6 Pilot Rules that Everyone Should Live By
The principle of “Aviate, Navigate, Communicate” is a fundamental tenet in aviation. There have been numerous aviation studies conducted revealing that pilots can become so engrossed in troubleshooting a problem that they inadvertently neglect their primary task of flying the aircraft.
The sailor's equivalent is "keep your eyes outside of the cockpit." Remember also that COLREGS says in Rule 5 (Look-out) that "Every vessel shall at all times maintain a proper look-out by sight and 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."
Note the "as well as" phrase, which means that eyes and ears come first, before instruments.