USCG Exam Practice · Rule 32 — Sound Signal Definitions
Under the Inland Navigation Rules, a vessel at anchor in restricted visibility sounds the required rapid bell signal. What additional optional whistle signal may she sound to warn an approaching vessel?
- AOne prolonged blast
- BTwo prolonged blasts
- COne short, one prolonged, and one short blast✓ correct
- DOne prolonged followed by two short blasts
Why C is correct
33 CFR §83.35(g) states that a vessel at anchor may in addition sound three blasts in succession — one short, one prolonged, and one short blast — to warn approaching vessels. This is optional and supplements the mandatory bell signal.
Cited:33 CFR §83.35
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