| 2. OPERATION |
SAIL: | Warning signal for sailboats, tug boats and tow boats underway. One 3-second |
| blast, followed by one 2-second interval, one 1-second blast, one 2-second |
| interval and one 1-second blast. Repeated every 120 seconds. |
| 1 s |
3 s
| | | 120 s | |
| | | | |
| | | Sailing signal |
TOW: | Warning signal for vessels under tow. One 3-second blast, followed by one |
| 2-second interval, one 1-second blast, one 2-second interval, one 1-second blast, |
| one 2-second interval, and one 1-second blast. Repeated every 120 seconds. |
| | | 2 s |
3 s
120 s
Towing signal
STOP: Warning signal for power-driven vessel that is stationary. Two 3-second blasts, with a 2-second interval between each blast, repeated every 120 seconds.