The business of geotagging images is not exactly in my radar and after all, what advantages does buying that additional GPS module do to our overall photographing experience?
Imagine the following...
Have you ever wanted to quickly find all the photos taken at say, your favorite beach?
Chances are that unless you've been meticulous in filing your photos or tagging them with keywords, this could take quite a bit of time.
Wouldn't it be easier if you could click on your beach on a map, and bring up all of your photos within 1km, or display all of your holiday photos on a map?
This is the promise of geotagging.
Simply put, geotagging records the latitude and longitude of the camera at the time the photo was taken and stores it in the image file.
The Nikon D90 GPS module GP-1 cost approximately $250 at time of writing.