Hey all, I was wondering what your thoughts were on the best geotagging device to attach to my Nikon D5000. I have the GP-1 but it does not have an internal compass to give me heading information. I will be in a helicopter taking pictures and so I would like a 3 axis geotagging device that records the bearing/heading information onto the EXIF header. What can you guys recommend for a device? Any help is appreciated.