2 short
Altering to port
1 short
Altering to stbd
3 short
Altering astern propulsion
5 short
Danger
2 long 1 short
Overtake on your stbd
2 long 2 short
Overtake your port
1 long
Underway
2 prolonged
Power driven vessel underway but stopped
4 short
Piloting vessel
1 long 2 short
Not under command
1 long 3 short
Vessel being towed