Other examples of shapes and their disposition
Sound signals must be used when needed and in restricted visibility.
There are only three types of sound-signal equipment mentioned in the Rules – whistle, bell and gong, with the latter only required on vessels 100 meters or more in length. As with everything else, the specifications of the equipment are prescribed in the rules. The whistle and gong are used by larger vessels when anchored in poor visibility in addition to the normal sound signals.
A “short blast” is a signal on the foghorn (or whistle) of about one second duration.
A “long blast” is of four to six second duration.
When moving, a ship may use the following basic signals to “contact” other ships:
One short blast – I am altering my course to starboard.
Two short blasts – I am altering my course to port.
Three short blasts – I am operating astern propulsion.
Make-up word combinations and translate them:
1) short aground 1)____________________________
2) sound visibility 2)____________________________
3) sailing blast 3)____________________________
4) stern mile 4)____________________________
5) vessel light 5)____________________________
6) vertical blast 6)____________________________
7) main vessel 7)____________________________
8) restricted light 8)____________________________
9) masthead line 9)____________________________
10) nautical signal 10)___________________________
11) running mast 11)___________________________
12) long lights 12)___________________________