I have the Curve 8330. I use Intelligolf
with an Ambicom GPS Puck
I find it to be fairly accurate. Sometimes it is exact, compared to the yardage markers. Other times, it can be off by 5 yards, or so.
Some of the courses on the Intelligolf website may not have the GPS locations. You can easily add them using their web-based program, hand enter it using the GPS data obtained from Google Earth, or add them real-time while you are playing a round at the golf course.
I don't know if Intelligolf is compatible with the Tour.