I've only released it to the flight sim community. The pdf version says it is encouraged for all to use the SRD, PDF and electronic version at a no cost. I say in my version not for real world flight planning . . although it could be really. No mention of copyright in the SRD. I won't think about a commercial version of my SRD program if there is one already. I just wondered how big their updates were . . mine are only 205K and what there version looked like.
Anyway thanks for your input.
Graham