If you are towing another vessel you display a yellow light instead of a stern light.
Sailing vessel at anchor lights. One of these lights or shapes shall be exhibited near the foremast head and. Vessels under 7m are exempt unless anchored in a narrow channel or anchorage or where other vessels usually navigate. In addition to the above a vessel will have other lights and day shapes to characterize the nature and activity of a boat.
Rule 30 Anchored Vessels and Vessels around a What a vessel at anchor shall exhibit b What a vessel of less than 50 metres in length may exhibit when at anchor c What a vessel of over a 100 metres in length shall exhibit in addition. This is probably the most confusing part of sailboat navigation lights so if you are confused about this youre in good company as most people are. It does not display a forward facing masthead light as that would mean it was being propelled by machinery.
Lightship adrift from her moorings. An anchor light for a boat less than 50 meters in length is an all-around white light visible for 2 miles exhibited where it can best be seen see Figure 7. A light visible from all around that is turned on at night whenever at anchor or tied up to a mooring.
A sailing vessel may exhibit at or near the top of the mast two all-round lights in a vertical line. These lights must not be exhibited in conjunction with a combined lantern tricolour lantern. FA vessel engaged in mine-clearance operations shall in addition to the lights prescribed for a power-driven vessel in Rule 23 or to the light or shape prescribed for a vessel at anchor in Rule 30 as appropriate exhibit three all-round green lights or three balls.
The upper one red and the lower one green. The upper one red and the lower one green. All vessels at anchor must exhibit a white anchor light if required.
Sailing vessels at anchor are very easy to pick out at night since all they need to have on display is their all-round light. For sailboats operating under motor power. This means that you have right of way over most boats.