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From what I am seeing the general consensus seems to be GEO Tagging to determine and/or track locations.

It is kinda techie so I will add some 8chan info.

Geotag information in a JPEG photo, shown by the software gThumb

Geotag information stamped onto a JPEG photo by the software GPStamper

Geotagger “Solmeta N2” for Nikon D5000 DSLR

Geotagging or GeoTagging, is the process of adding geographical identification metadata to various media such as a geotagged photograph or video, websites, SMS messages, QR Codes[1] or RSS feeds and is a form of geospatial metadata. This data usually consists of latitude and longitude coordinates, though they can also include altitude, bearing, distance, accuracy data, and place names, and perhaps a time stamp.

Geotagging can help users find a wide variety of location-specific information from a device. For instance, someone can find images taken near a given location by entering latitude and longitude coordinates into a suitable image search engine. Geotagging-enabled information services can also potentially be used to find location-based news, websites, or other resources.[2] Geotagging can tell users the location of the content of a given picture or other media or the point of view, and conversely on some media platforms show media relevant to a given location.

The related term geocoding refers to the process of taking non-coordinate based geographical identifiers, such as a street address, and finding associated geographic coordinates (or vice versa for reverse geocoding). Such techniques can be used together with geotagging to provide alternative search techniques.

On the darker side, however, there is a risk of “social surveillance by GPS” with geotagging. People intent on stalking you can make use of public geotagging information to pinpoint your location, home, and even your activities with very little effort. What that can mean in terms of your safety and security will depend on who you are, where you live, and the value to anyone watching your movements but it does pay to be careful. Avoiding the risks of geotagging is one more important thing to keep in mind in this day and age of diminishing privacy, and here are some suggestions to help.