For a vessel less than 12 meters this light can be split into two parts with one being stern mounted and aft facing and the other mast mounted and forward and side facing.

Sailing vessel under power day shape. Anyone who is responsible for a vessel at sea from the smallest dinghy to an ocean going supertanker day or night must be able to recognise other vessels and quickly interpret what they see around them. Unlike many flags or lights that vessels display the only color here is black. This is not always easy especially in crowded coastal waters.

A boat under sail alone will have red and green sidelights and a stern light but since it is not under power it will not have a masthead light. A masthead light forward. The lights for sailing vessels are very similar to those of power driven vessels plus a couple of extra options.

Except in LIS and Canadian waters a power-driven vessel 7TL long with maximum speed knots may use only an all-round white light plus sidelights it practicable A vessel using both sails and engine is a power-driven vessel day she must show a conical ghapï At night ghe shows lights as a P vessel. The vessel will be considered as a power driven vessel. It does not display a forward facing masthead light as that would mean it was being propelled by machinery.

Power - Large Sailing Vessel. Constrained by Draft 3 red vertical lights. This means that a tricolour lantern or two redgreen masthead lights must not be used under power.

Not under command Now for the night views. C Vessel proceeding under sail and also under steam or other mechanical power shows one black cone 2 feet in diameter. Some can identify a fishing vessel or a sailboat under power and so on.

Free Guide to ColRegs the International Regulations for Preventing Collisions at Sea the IRPCS or Collision Regs. Due to her water draft she needs the deepest parts. Any vessel anchored will display a black disc which is the day shape indicating the vessel is anchored.