Re: X-MEN: FIRST CLASS - Grading+Discussion **SPOILERS!**
Well, there was the scene interspersed with the montage where Emma implicitly states in dialogue that she can feel Professor X reaching out with his mind, that somehow he's amplified his telepathy and that they must be recruiting. Presumably she could tell where his "reaching out" was coming from.
I don't think so... if you recall right before she tells Shaw about what's going on, she's on the bridge with Azazel looking for any other boats or subs. The reason she knows that he's amplifying his powers is because they couldn't find any vessels nearby that he could be on.
"If it weren't for stupid, difficult races, there'd simply be no point to living."
Sometimes you just gotta roll the hard six- Bill Adama