INTERNATIONAL ONLY Power driven vessels "A" and "B" are meeting on a river as shown in illustration D041RR below and will pass 1/4 mile apart. Which action should the vessels take?

Correct Answer: Option A — The vessels should continue on course and pass without sounding any whistle signals.

Under COLREG Rule 34(a), meeting vessels safely passing at a distance of a quarter-mile or more on open waters or rivers continue on course without sounding maneuvering whistle signals, as signals are only required when actively altering course or taking action.