INLAND ONLY Two power-driven vessels are meeting in a narrow channel as shown in illustration D037RR below. Which of the following statements is TRUE?

Correct Answer: Option A — If agreement is reached by radiotelephone whistle signals are optional.

33 CFR 83.14(a) (Rule 14) states that in Inland waters, if two power-driven vessels are in sight of one another and reach an agreement by radiotelephone, they are not required to sound the whistle signals. This exception simplifies communication and reduces confusion in busy, narrow channel navigation.