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by applying power astern.”
(4) Five or more short blasts in rapid succession; mean* ing: “DANCER”; or ”1 do not understand your intentions;” or “1 do not concur in the man* euver indicated by your signal.”
(b) Whenever a Class I, 2, or 3 motorboat receives one of the above signals from an approaching vessel, and if the operator understands the signal and concurs in the maneuver, he will answer with a similar signal. Whenever the intention of the approaching vessel is unclear, or if the proposed maneuver appears to involve risk of collision or other danger, the motor boat receiving the signal will answer with five or more short blasts in rapid succession, whereupon the operators of both vessels will slow, stop, or change course as necessary to avoid collision.
(c) Motorboats> not required to have sound-producing devices on board are not required to give or answer horn or whistle sig-, nals, but if they have soundproducing devices on board and elect to give or answer signals, the standard signals prescribed in the foregoing rules shall be used,, and none other.
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