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22 January, 12:43

What does one prolonged blast plus one short blast signal to a river lock attendant?

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  1. 22 January, 13:09
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    When you are approaching a river lock, you are expected to sound one prolonged blast and one short one in order to signal to the lock attendant that you want to pass through. You are to sound the blast when you are about one mile away from the river lock. The attendant will reply you with one of the traffic signals in order to instruct you about what to do.
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