Rule 19: Radar collision avoidance

There is no such thing as stand-on or give-way in conditions of bad visibility, as this reminder explains.

Radar collision avoidance
 
Rule 19 of the International Regulations for Preventing Collisions at Sea is often dangerously misunderstood. Simpy put, there’s no ‘stand on’ vessel in fog.
   
 
 
 
   
If we see a target on a collision course in sector A, we turn to starboard (unless we are overtaking it) and if in sector B we turn to port. In the grey areas we need to be very careful. Make large alterations in course and/or speed and don’t assume the other vessel has seen you – or understands Rule 19.
For a fuller explanation, see John Williams’ article in PBO 396, p102-104.

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Chart changes and passage planning