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lations shall exonerate the operator of any vessel from the consequences of any neglect to carry and display lights as required by law; or of any neglect to keep a proper lookout, or of neglect of any reasonable precaustion which may be required by the ordinary practice of good seamanship or by the special circumstances of the case. R30-13. (a) Whenever motorboats are approaching in a meeting, crossing, or overtaking situation, and it appears desirable to the operator of one of the vessels to communicate his intentions to the operator of the other, the following standard whistle or horn signals will be used, and none other:
(1) One short blast; meaning: “I am altering my course to starboard,” except that in a crossing situation when this signal is initiated by the vessel to starboard of the other it means, “I am holding my course and speed. Two short blasts; meaning: ”1 am altering my course to port.”
(3) Three short blasts; meaning: “I am stopping, or backing, by applying power astern.”
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