"You don't need a fancy camera with a built-in GPS
receiver to geotag your photos. An Android device with the Open GPS
Tracker app and digiKam can do the job just fine. The app lets you
track your route and save it as a GPX file which you can then use
to geocorrelate your photos in digiKam.
"Geocorrelation is a relatively simple process which assigns
geographical coordinates from the GPX file to the photos based on
their time stamps. So for this technique to work its magic, you
must sync the time on your Android device with your camera. When
you head for a photo walk, launch Open GPS Tracker on your Android
device and start a new tracking session. When you are back home,
stop the tracking session, and use the Share Track button in Open
GPS Tracker to save the recorded track in the GPX format on the SD
card or send it via email to your machine."
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