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...
At Anchor, It is used addition to the required rapid ringing of the bell for five seconds (not to exceed one minute interval) to let other vessels know her location.