I have mentioned it before, but to us it would be very important to keep the EXIF data that is on the images. You can turn on location tagging on the camera of your phone. If this data is kept, my users don't have to use an extra gps to track their position when their in the field. The same goes for the date and time the photo was taken.
Now I put on al lot of friendly faces and hope you like the idea [^]