First, there is a firmware update coming on Friday...I'd wait and see what that update includes (although I don't expect anything in the GPS arena)
2) Go over to XDA and search....there are a couple of different threads that deal with GPS......In my opinion, the fixes work good when stationary.....but when moving, they are marginal.
3) Do like I do for navigation....Use an external GPS receiver.....If your family has both an IPad and the Prime, the DUAL GPS is a good option.....it will work in either platform
Bob