I think it's safe to say that a gps with an integrated gps would definitely work for my project
Your compass will not point true north (in most locations). It can be off as much as 20 degrees, well more than your bean angle.
What is the speed of the moving part of the system?
What are the consequences of LOS?
And, most importantly - what is the budget?
Sorry, I don't know what "LOS" means.