Thanks... but I'm looking for some evidence to support that... I have an OSC application being considered and i have included references to those satellite systems but i'm still coming up short with supporting evidence just in case i'm challenged. The annoying thing is that I wouldnt have included that if i hadn't read it somewhere!
Ah, I see. Less is more sometimes.

Usually, the maximum number of satellites viewable from any one constellation is around 12 (certainly in the UK you will be lucky to see that number on one constellation). That is the maximum amount above the horizon at any one time.
You will often see 14-16 satellites in the UK on the Inspire platform which can only mean it is receiving more than one constellation.
There is also reference to both systems in DJI tech specs if I remember correctly (although they keep changing the page)