From the http://fishwrecked.com/forum/landbased-mauds-broad-bar-mack thread an explanation was required.

The interesting thing is that many cameras these days also have on board geo location features, so it is not just mobile phones you need to be worried about.

When an image is saved by a mobile phone camera or camera, it is saved in a file format on the cameras storage media.  Embedded in the file format (JPEG, TIFF etc) is another type of data that saves information about the image, such as time, date, location, people tagged in the image, size, resolution etc.  This data is known as EXIF:

P.S Apologies for the length of the post, I was testing how to view the geolocation on images in windows 7 but none of my mobile captures have had the gps on.  I will test it today after I get back from work.

Exchangeable image file format Filename extension .JPG, .TIF, .WAV Developed by JEITA, CIPA Initial release 1995 Latest release 2.3 / 26 April 2010; 2 years ago Extended from TIFF, JPEG, WAV Extended to DCF

Exchangeable image file format (Exif) is a standard that specifies the formats for images, sound, and ancillary tags used by digital cameras (including smartphones), scanners and other systems handling image and sound files recorded by digital cameras. The specification uses the following existing file formats with the addition of specific metadata tags: JPEG Discrete cosine transform (DCT)[1] form compressed image files, TIFF Rev. 6.0 (RGB or YCbCr) for uncompressed image files, and RIFF WAV for audio files (Linear PCM or ITU-T G.711 μ-Law PCM for uncompressed audio data, and IMA-ADPCM for compressed audio data).[2] It is not supported in JPEG 2000, PNG, or GIF.

This standard consists of the Exif image file specification and the Exif audio file specification.

http://en.wikipedia.org/wiki/Exchangeable_image_file_format#Geolocation

Geolocation

The Exif format has standard tags for location information. As of 2012 a few cameras and a growing number of mobile phones have a built-in GPS receiver that stores the location information in the Exif header when a picture is taken. Some other cameras have a separate GPS receiver that fits into the flash connector or hot shoe. Recorded GPS data can also be added to any digital photograph on a computer, either by correlating the time stamps of the photographs with a GPS record from a hand-held GPS receiver or manually by using a map or mapping software. The process of adding geographic information to a photograph is known as geotagging. Photo-sharing communities like Panoramio, locr or Flickr equally allow their users to upload geocoded pictures or to add geolocation information online.

Most of Nokia's Nseries mobile phones (such as the N95) have a GPS receiver and use Location Tagger,[4] a piece of software from Nokia Beta Labs. All captured images are tagged with corresponding GPS coordinates when a GPS signal is available. The second generation of iPhone (known as the iPhone 3G) by Apple Inc. is also equipped with a GPS receiver and uses the receiver to geotag photographs taken with the device. Subsequent generations (the iPhone 3GS, 4 & 4S) also support this feature. The first generation iPhone is not equipped with GPS, and uses a service provided by Skyhook to triangulate and approximate the location at which a picture was taken - using nearby cellular-phone towers and WiFi hot-spot signal-strength data. The Skyhook service provides approximate GPS location information which is then added to the Exif data associated with the picture. Also mobile phones with the Android operating system as well as BlackBerry smartphones with a camera and built-in GPS or Bluetooth GPS add-ons can geotag images with the included camera application.

Viewing and editing Exif data

In Windows XP, a subset of the Exif information may be viewed by right clicking on an image file and clicking properties; from the properties dialog click the Summary tab and then the Advanced button. However, using this tab to edit Exif information may damage certain Exif headers.[19] As of the release of Service Pack 3, Windows XP still shows evidence of corrupting Exif tags when modifying JPG file properties via the file properties window.[citation needed]

On Mac OS X 10.4 and above, basic Exif information may be viewed in the Finder by doing Get Info on a file and expanding the More Info section.

On Unix systems using the GNOME desktop environment, a subset of Exif data can be seen by right clicking the file in the Nautilus file manager and selecting properties. In KDE, it can be seen by right clicking in the Dolphin file manager, selecting "Properties" and then "Information".[citation needed] Many Unix image viewers give the full set of Exif data.

In addition, there are many software tools available which allow both viewing and editing of Exif data.

Sharing photographs with Exif information may present privacy problems such as revealing a location. Such information may be edited out before sharing the file. Alternatively, there are metadata removal tools that will remove Exif information.