Exactly right. It's very difficult to tell without a reference.

"Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom wrote in message
...
Something else not often mentioned in these threads is that it very
difficult to determine
the nature, course and speed of a boat as it first appears through the
fog. Neal has
claimed that the instant he sees another vessel he can turn away. The
problem is that
such an instantaneous response could be completely wrong.



"Tim Roberts" wrote in message
...
Yet again Simple Simon shows the world that he has never actually been
at
sea in fog.

It is NOT easy to tell the bearing of a vessel by just hearing a sound
signal in fog.






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