Under both the International and Inland Rules, assumptions shall not be made on the basis of scanty information, especially ______.

A. scanty visual information at night
B. scanty VHF radio reports from other vessels
C. scanty depth sounder readings
✓ scanty radar informationCorrect

Why D is correct

COLREGs Rule 7(c) and 33 CFR §83.07(c) both single out scanty radar information specifically as an impermissible basis for assumptions about risk of collision.

Cited:COLREGs Rule 7 33 CFR §83.07

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