Precautions in Fog

Fix your position immediately while you can still see landmarks. Switch on navigation lights. Start sounding fog signals (one prolonged blast every two minutes for a power vessel, one prolonged + two short blasts for a sailing vessel). Post extra look-outs — use eyes AND ears.

Reduce speed. Under Rule 6, every vessel must proceed at a safe speed adapted to the prevailing visibility. Have your radar reflector hoisted, and use radar or AIS if available. Put on lifejackets and consider clipping on harnesses.

Plot your position regularly using GPS. Monitor depth — your echo sounder is now a critical navigation tool. Consider anchoring if you are near shallow water and uncertain of your position.