Read a newer article on how to do this using an iPhone instead.
I just love gadgets. That’s why it’s nice to find that I bought a Garmin eTrex a long time ago. Haven’t used it in years, but then when Apple released the latest version of iLife 09 with the map function in iPhoto I realized that it is very cool to have all the images geo tagged. So I found a program called GPSPhotoLinker, a program that downloads GPS data and pictures and by the date/time on the pictures manages to add longitude and latitude information in the picture info. When you import pictures with this information iPhoto can use that to show it on maps and make it searchable. And when you upload pictures to Flickr, it also uses the location information place your picture on a map. Very cool.