Re: Kestral with Horus Atrag???
If you put it that way and you're talking about extreme ranges or variations in elevation/weather that make enough of a difference. ..or possibly, competitive shooting, then it sounds interesting.
Around here, elevation, weather, and distances don't vary enough to bother.
You might just need a differnt range card for cold or hot weather.
Then, there's always the wind to contend with. I assumed that's what the device/program was attempting to do which would be fine if it sends a probe downrange to report back.