Nav Camera (US$3.99) is an innovative app that uses navigation, augmented reality and display overlays to tell you where you are, your altitude, the direction you are facing and more. The information appears on your image in real time and it's possible to save it all to your photo library.
Nav Camera is going to find a home with surveyors, engineers, architects, sportsmen, and military and police agencies. When you view your image in Nav Camera, it has a time stamp, position, altitude, GPS Datum and compass bearing. The app also supports custom notes, which can be a project name or any other pertinent information you want to add.
Using the app is easy enough. All the controls are superimposed over your live image, and you can select stills or video and make color decisions about the displayed data overlay. Nav Camera also features colored filters that are applied in real time to preserve night vision.
Certainly there are many other apps that will show your position and display other metadata like camera exposure information, but Nav Camera doesn't require another app to view the data -- it simply overlays it on your images.