Under the Inland Navigation Rules, what is the minimum number of short blasts required for the doubt or danger signal?

A. Three
B. Four
✓ FiveCorrect
D. Six

Why C is correct

33 CFR §83.34(d) requires at least five short and rapid blasts on the whistle when a vessel is in doubt about the intentions or actions of another vessel. Three blasts indicate astern propulsion; four and six are not prescribed signal quantities under this rule.

Cited:33 CFR §83.34(d)

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