Definition
When vessels are in sight of one another, a power-driven vessel under way and taking action gives one short blast for altering course to starboard, two short blasts for altering to port, and three short blasts for operating astern propulsion. These may be supplemented by matching flashes of an all-round white light lasting about a second each. In United States inland waters the equivalent signals state intent and call for an answering signal of agreement.
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