[aprssig] Calculating two-sat visibility

[A.J. Farmer (AJ3U)]

I was wondering how to calculate when PCSAT and PCSAT2 would have
mutual footprint passes at my location.  I quickly stumbled upon the
"two-sat visibility" calculator under the utilities menu in Nova.  It
is easy to use and works great.  I'm just posting this for anyone that
wanted to do the same calculation.

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A.J. Farmer, AJ3U
http://www.aj3u.com