"MC" wrote in message -
Sorry, a point of information. The regs are clear. You may have to stop
your vessel in restricted vis. The sound signal may even chnage as a
result...


The regs are not that clear. Stopping (or not leave dock) may be the
appropriate action in many cases. However, it is not appropriate for an LNG
tanker to stop engines and drift if there's fog on the high seas. Nor is it
appropriate to anchor in a narrow channel or TSS.