>>>>>>As a separate issue:  With rare exceptions, the largest visibility
you will see reported in a metar is 10SM (in the US) or 9999 (meters,
elsewhere).

This is a problem for real-weather fetch, because the _reported_
visibility can be significantly less than the _real_ visibility.

I have tried to think of a heuristic to solve this problem, 
without success.  Sometimes a report of 10SM means 10SM and 
no more, but sometimes it means unlimited visibility.
[...]
The FG scenery looks nice when the visibility is unlimited.
It would be a shame to stumble into a situation where typical
users were stuck with 10SM visibility instead of the really
real visibility.
[...]
The bold solution would be to map 10SM and 9999 meters to
unlimited visibility ... but I'm not bold enough to recommend
that. >>>>>>

>From a users viewpoint, 10SM on a monitor looks like less to the eye than 10SM 
>looking out the window. It would be a disservice to the scenery to run the 
>risk of unlimited visibility being presented as 10SM. 
IMHO there is no choice other than the bold solution- anything reported as 10SM 
= unlimited, and 9.99 and less is actual. 

Peter Brown
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