Geotagging allows you store the location where a photo was taken right in the photo itself. JPEG files, the format used
by most digital cameras, store a wide range of information about the picture (shutter speed, aperture, ISO speed) and the
camera that created it. This information is called metadata. Your digital camera has a clock, and the time that the photo
was taken is stored in the JPEG file as part of the metadata. Your GPS also stores timestamps with each trackpoint in the
tracklog. By matching the timestamp from the photo with the timestamps in your GPS tracklogs, ExpertGPS is able to automatically
determine exactly where you were standing when you snapped each picture.
Geotagging in ExpertGPS has the following requirements:
Your digital camera must have a clock, set to the correct local time.
Your photos must be stored in JPEG format, not BMP or RAW.
Some image editing programs destroy metadata. You must geotag your photos before cropping or rotating in older image editing programs.
Your GPS receiver must be capable of recording tracklogs with timestamps. Garmin users must use the ACTIVE LOG - saved tracks do not have timestamps.
For best results, you should synchonize your digital camera's clock to GPS time prior to taking photos. Check
the camera's clock time every few months for drift.
Set your GPS to record track points on a frequent basis. The more trackpoints you record, the better your
geotagging results will be.
The most common mistake is having the wrong date set on your digital camera. Triple-check the date - especially
To geotag your photos, do the following:
Confirm that your camera's clock is synchronized to the time displayed on your GPS.
Turn on your GPS receiver, wait for a solid lock on 4 or more satellites, and ensure that it continues to maintain
good satellite reception while you take photos. You can place your GPS in a jacket pocket or backpack - you will not need
it in hand while photographing.
Take your photos. There is no need to mark a waypoint or do anything special with your GPS at each photo location, other
than confirm that your GPS is recording a continuous tracklog.
When you return to your computer, receive the tracklog from your GPS and save it in GPX format.
Move the photos from your digital camera to a folder on your computer. ExpertGPS will be writing geotagging information
into the photos. Make a back-up copy of your photos before proceeding.