The International Regulations for Preventing Collisions at Sea (IRPCS) specify the use of lights on vessels to indicate their presence, position, and intentions to other vessels. These lights are essential for maintaining safe navigation, especially during periods of reduced visibility such as at night or in adverse weather conditions. Let’s explore the lighting requirements outlined in the IRPCS:

Navigation Lights:

Vessels underway (not at anchor or aground) must display navigation lights that indicate their size, type, and direction of movement. These lights consist of a red light on the port (left) side, a green light on the starboard (right) side, and a white light at the stern (back) of the vessel.

These lights help other vessels determine the direction of travel and facilitate the identification of the vessel’s status and type.

Anchor Lights:

A vessel at anchor must display an all-around white light where it is visible from all directions.

This light helps other vessels identify an anchored vessel and take necessary precautions to avoid a collision.

Special Lights:

Certain types of vessels, such as fishing vessels, towing vessels, and vessels engaged in specific operations, may have additional lights to indicate their particular activities or status.

These lights are designed to convey specific information about the vessel’s actions or limitations to other vessels in the vicinity.

Restricted Visibility Lights:

In situations of restricted visibility, such as during fog, vessels must display lights to enhance their visibility and enable other vessels to take appropriate action to avoid collisions.

These lights typically include a masthead light, a forward white light, and side lights to indicate the vessel’s presence and direction.

It is crucial for mariners to understand and comply with the lighting requirements specified by the IRPCS. By doing so, vessels can effectively communicate their position, status, and intentions to other vessels, thereby promoting safe navigation and reducing the risk of collisions.

Remember to regularly check and maintain the proper functioning of your vessel’s lights, ensure they are visible and in accordance with the IRPCS, and exercise caution when interpreting the lights displayed by other vessels.