BOTH INTERNATIONAL & INLAND While underway and in sight of another vessel, less than one half mile away, you put your engines on astern propulsion. Which statement concerning whistle signals is TRUE?

A
You need not sound any whistle signals.
B
You must sound one blast if backing to starboard.
C
You must sound whistle signals only if the vessels are meeting.
D
You must sound three short blasts on the whistle.
E