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These are useful to know, especially if you are have to cross, or are diving close to, shipping lanes.
Introduction
Please note that a long blast is about four to six seconds and a short blast about one second
| Signal |
Meaning |
| Power driven vessel making way |
one long blast every 2 min's |
| Power vessel underway but stopped |
two long blasts every 2 min's |
| Sailing vessel |
one long two short every 2 min's |
| Vessel not under command |
one long two short every 2 min's |
| Vessel constrained by her draught |
one long two short every 2 min's |
| Vessel fishing |
one long two short every 2 min's |
| Vessel at anchor |
bell rung rapidly for 5 sec's at intervals of not more than 1 min |
When both vessels can see each other
| Signal |
Meaning |
| One short blast |
I am altering course to starboard |
| Two short blasts |
I am altering course to port |
| Three short blasts |
I am operating astern |
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