passing on the port side from behind
Well, honey, three long blasts followed by two short blasts from a Great Lakes ship means they're backing up, just like your ex trying to come back into your life after they realize they messed up. So, keep your distance and let that ship do its thing before it ends up in hot water.
Runaway ship
2 short blasts
you better get off that ship!!Two short blasts means that the vessel intends to leave you on it's starboard side. If you are in international waters it means " I am altering my course to port"
2 short blasts
I intend to pass you on the starboard(right) side
You need to transmit the Morse letter D (-..) with either a fog horn or hitting a bell every 2 minutes. Long blasts need to be 3 times as long as short blasts. The space between blasts is as long as the duration of a short blast. So the sequence goes like this: Blow the horn or hit the bell for 6 seconds, wait for 2, hit it for 2 seconds, wait for 2 seconds, and hit it again for 2 seconds.
Two short horn blasts from another vessel typically indicate that the vessel is maneuvering to overtake or pass you on your port (left) side. This is a signal used to communicate intentions between vessels to ensure safe navigation and avoid collisions. It’s important to respond appropriately by maintaining your course and speed, allowing the overtaking vessel to pass safely.
1 blast means, I am turning to starboard (right) 2 blasts means, I am turning to port (left) 3 blasts means, I am going astern (backwards) 5 blasts means, I don't know what you are doing, get out of my way.....and usually accompanied by colourful language and waving of arms etc. Often heard around the commercial jetty when recreational boats get in the way of large commercial ferries etc...
4 short blasts are the letter H is morse. On the River Clyde in Scotland a local bye law allows it to be signalled by a vessel going astern from a berth, generally a paddle steamer, indicating that it is going astern, it has difficulty in manoeuvring and warning other vessels to keep clear.
Patrol Torpedo Boat
They were the submarines of the German Navy. U-boat is short for undertseeboote (undersea boat).