| 1. | 3 short siren signals : vessel is going backwards
短声号三响：表示本船正在开倒车 |
| 2. | 2 short siren signals : vessel is turning left
短声号两响：表示本船正把航向转左 |
| 3. | 1 short siren signal : vessel is turning right
短声号一响：表示本船正把航向转右 |
| 4. | Short siren signal : lasts for about 1 second long siren signal : lasts for 4 - 6 seconds
短声号一词指历时一秒左右之声号。 |
| 5. | When two vessels meet , the moving vessel should give siren signal to show its intention
船舶互相见到时，航行中之机动船舶必须用汽笛发放下列信号以示意： |
| 6. | Vessels can also use light signal to supplement the siren signal . light signals can be repeated if appropriate
船舶可利用灯光信号以补声号之不足，更可在适当时重覆。 |
| 7. | For the ship that is being get over , it should show its consent by giving the following siren signals , one long , one short , one long , one short
将被超越之船舶，倘欲表示同意，必须用汽笛发出一长一短一长及一短之笛号，依次序发出。 |
| 8. | In case of narrow water passageway , a vessel must give siren signal to show its intention of getting over the other vessel . 2 long , 2 short : vessel will get over on the left
在狭窄水道或航道互相见到时，船舶如欲追越另一艘船时，必须发出以下汽笛信号，将意向表明： |
