RE: Freqing out
Same frequency BANDS. Look up communication theory on 'spread spectrum' communications - your CDMA mobile phone works perfectly fine sharing the same band as hundreds of others with one basestation.
I've seen this on several sites, and I can't for the life of me work out what the story is here. I'm working on a Galileo based project that has been going since early 2006 which the *fundamental* idea was to use GPS + Galileo signals - why would you need an agreement from either party? They both have open signals which dual use receivers were always going to be designed to take advantage of.