I did look it up.
The two vessels are:
A pilot vessel on duty sounds 4 short blasts (H) as well as all the other appropriate signals.
A vessel under 12 metres can sound any efficient signal underway or at anchor.
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There is a tide in the affairs of men,
Which, taken at the flood, leads on to fortune;
Omitted, all the voyage of their life
Is bound in shallows and in miseries.
Shakespeare, Julius Caesar IV, iii, 217
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