Rules of the Road: INTERNATIONAL ONLY Power-driven vessels "A" and "B" are meeting on a river as sh...

ROR 16

Rule 34 (a) When power-driven vessels are in sight of one another and meeting or crossing at a distance within half a mile of each other, each vessel underway when maneuvering as authorized or required by these Rules:
(i) Shall indicate that maneuver by the following signals on her whistle:
(1) One short blast to mean "I intend to leave you on my port side";
(2) Two short blasts to mean "I intend to leave you on my starboard side"

Test 1

Note the INTERNATIONAL ONLY.

This is a stupid question. I am fairly confident there are no rivers outside Inland America. If it was Open ocean then yes nothing needs to be done, but it clearly says river.

I agree that this is one more of those stupid questions with only 57% of supposedly correct answers. One should just ignore them.

The point of this question is to check one's understanding of Rule 34. International rules only require/allow maneuvering and warning signals when the vessel is maneuvering. On the inland side, a signal would be required.

For deeper review, not all US waters are inland rules, such as Seattle and Key West.
"§ 80.1395 Puget Sound and Adjacent Waters. The 72 COLREGS shall apply on all waters of Puget Sound and adjacent waters, including Lake Union, Lake Washington, Hood Canal, and all tributaries." (NavRules Handbook, p. 157)

The word "river" thrown in there to intentionally trick you. If I'm learning one valuable lesson here, it's to READ THE QUESTION CAREFULLY!

Great advice Malolo! RTFQ - Read The Full Question!