Lights at night
These are the lights that any craft must show from sunset to sunrise and also in or near restricted visibility. They vary according to a crafts size and there are different lights for vessels under power and vessels under sail.
Power driven vessels underway
Masthead light - second masthead light aft and higher - sidelights - sternlights
Masthead light - sidelights and sternlight
May show all-round white light (instead of masthead light and sternlight) + sidelights.
Under 7m and speed under 7 knots
May show all round white light only.
Vessels under sail
Sidelights and sternlights only - no masthead light.
Under 20m may have combined masthead lantern (red/green/white) with no other lights.
(Rare) A yacht may carry an all-round red over green, plus side and stren lights.
A sailing yacht when motor sailing shows the same lights
Non powered vessels under 7m i.e. canoes, kayaks, paddleboards and rowing dinghies must show a white light or use a torch to indicate its presence.
Vessels at anchor
All round white light forward
A second white aft (lower than for'd light)