20 |
 |
Signal station in general |
 |
21 |
 |
Signal station showing International Port Traffic Signals |
|
22 |
 |
Traffic signal station, Port entry and departure signals |
|
23 |
 |
Port control signal station |
|
24 |
 |
Lock signal station |
 |
25.1 |
 |
Bridge passage signal station |
|
27 |
 |
Telegraph station |
 |
28 |
 |
Storm signal station |
|
29 |
 |
Weather signal station, Wind signal station |
|
30 |
 |
Ice signal station |
|
31 |
 |
Time signal station |
|
32.1 |
 |
Tide scale |
 |
32.2 |
 |
Automatically recording tide gauge |
 |
33 |
 |
Tidal signal station |
|
34 |
 |
Tidal stream signal station |
|
35 |
 |
Danger signal station |
|
36 |
 |
Firing practice signal station |
|