Eye-Fi cards are SD memory cards which contain a built-in wireless transmitter. Providing you’re within reach of a suitable wireless hotspot, you can then transmit your pictures to a photo sharing site or, if you’re at home and have a wireless router, you can send them to your computer.
Eye-Fi Explore cards can also ‘geotag’ your photos. This isn’t done directly within the camera, though – the location information is added to the photos later using software on your computer. Eye-Fi cards don’t contain a conventional GPS receiver. Instead, they look for nearby wireless hotspots and use a service called Skyhook to look up their location.
As a result, coverage is variable and probably not as reliable as conventional GPS right now. It’s quick and simple, though, and as the Wi-Fi card demonstrates, the technology can be fitted into a tiny space.
Eye-Fi cards are very clever, but make sure you camera is Eye-Fi compatible before you invest.
