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The danger signal
on short blast
one short blast
one short blast
one short blast
one short blast
one short blast
One long blast can mean one of many things: 1) I am turning to starboard 2) In a situation of restricted view (ie turning a blind corner on a river) it's a warning signal to warn other vessels of your presence 3) In fog it is a general fog signal for vessels over usually over 12meters underway (this is repeated every 2 minutes)
one short blast
one short blast
one short blast
Depending on which side they intend to pass you on, they should give you and audible horn blast. One blast indicates passing on the starboard and tow blasts indicate passing on the port. Remember to return the same audible horn signal to let them know that you heard them and are aware of their intentions. One blast from them gets one blast from you and so on. The vessel being passed will remain the Stand - on vessel, which means you do not alter your course or speed. They, being the Give-way vessel must alter speed and course to pass.