Scanner Range and meaning of S##followmission ?

The scanner range selector, zoom in and out, does that affect the physical range of the senors or does it only vary the scale of the radar ?
There's a little dot below the scanner range indicator, what does that little dot indicate?. This dot is only evident in my Vulture's HUD.

I get this "S##followmission" text message, what do I do with that besides delete ?.

Many thanks.
 
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