Android app to send location information to a Nikon camera.
In fact, this turns an android phone into a bluetooth GPS receiver that can be attached to other devices that need NMEA gps data.This app uses the Android Location Provider to acquire periodical location updates. It will construct NMEA sentences out of these and then send those sentences to a paired bluetooth serial port.
Supporting hardware receives these sentences and then offer them to a Nikon D7000 camera.
The ongoing description of this project is at this page.