Sailing vessels underway and vessels under oars
A sailing vessel underway shall exhibit:
- sidelights;
- a sternlight.
In a sailing vessel of less than 20 metres in length the lights may be combined in one lantern carried at or near the top of the mast where it can best be seen.
A sailing vessel underway may, in addition to the lights, exhibit at or near the top of the mast, where they can best be seen, two all-round lights in a vertical line, the upper being red and the lower green, but these lights shall not be exhibited in conjunction with the combined lantern.
A sailing vessel of less than 7 metres in length shall, if practicable, exhibit the lights prescribed above, but if she does not, she shall have ready at hand an electric torch or lighted lantern showing a white light which shall be exhibited in sufficient time to prevent collision.
A vessel under oars may exhibit the lights prescribed in this Rule for sailing vessels, but if she does not, she shall have ready at hand an electric torch or lighted lantern showing a white light which shall be exhibited in sufficient time to prevent collision.
| Sailing vessel 1 | ||
 | ||
 |  |  |
| Abeam, port side | Ahead | Astern |
| Sailing vessel 2 | ||
 | ||
 |  |  |
| Abeam, port side | Ahead | Astern |
| Sailing vessel 3 | ||
 | ||
 |  |  |
| Abeam, port side | Ahead | Astern |
| Sailing vessel 4 | ||
 | ||
 |  |  |
| Abeam, port side | Ahead | Astern |
