INLAND ONLY Two power-driven vessels, "A" and "B" , are meeting in a narrow channel as shown in illustration D029RR below. Which statement is TRUE concerning whistle signals between the vessels?

Correct Answer: Option C — Both vessels should sound two short blasts.

33 CFR 83.34(a) (Inland Rule 34) applies to power-driven vessels in sight of one another. In a narrow channel, if vessels are positioned to pass starboard-to-starboard, both vessels must sound two short blasts to indicate their agreement to the maneuver and their intent to maintain their respective courses.