Restricted Visibility

Conditions in which a vessel’s ability to see is significantly reduced due to environmental factors such as fog, heavy rain, snow, or mist.

Restricted visibility is a critical term in maritime navigation, as it describes situations where a vessel’s crew cannot see as far as they normally would, making it difficult to navigate safely. This reduced visibility can be caused by various environmental factors, including fog, heavy rain, snow, mist, or even smoke. In such conditions, the risk of collisions with other vessels, navigational hazards, or even landmasses increases significantly. 

When operating in restricted visibility, mariners are required to follow specific rules and guidelines as outlined in the International Regulations for Preventing Collisions at Sea (COLREGs). These include reducing speed to a safe level, using sound signals to alert other vessels of their presence, and maintaining a proper lookout by sight and hearing. Additionally, radar and other electronic navigation aids become crucial tools in ensuring safe passage when visual cues are limited.

Restricted visibility also necessitates increased caution when interpreting the movements of other vessels, as their intentions or course may not be immediately apparent. Mariners must be prepared to take evasive action if necessary, and communication with nearby vessels via radio may be essential to avoid misunderstandings. Overall, restricted visibility demands heightened awareness, slower speeds, and the use of all available navigational tools to ensure the safety of the vessel and its crew.