I've been wanting to start geo-tagging photos so I could link gallerys into google maps so users browsing my site could view a map of where the photos were taken. There are devices that record geographical points and then there is software that can take the file they create and look through a directory of photos and match up the timestamps to tag the photos. This is nice but not quite as easy as some would like.
I found an interesting device that allows you to geo-tag without using a computer at all. This would be good for straight uploading to flickre or other photo sites. Combined with an Eye-Fi you might be able to take photos, tag them and upload them without ever getting close to a computer at all!
From the ATP Electronics site
ATP GPS PhotoFinder™ mini adds geotag data to your digital images, no complicated software required!
Simply turn the device on while you're taking pictures, and insert your card into the enclosed memory card slot on the docking station and it will automatically do the geotagging for you!
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Go to ATP Electronics website for more info. The device shown is the GPS Photofinder mini. The mini has the separate dock (card reader) so the GPS recorder is smaller. They also have the GPS Photofinder which includes the card reader in the device. It's gotten mixed reviews but the idea is neat. For those with a computer it's probably better to get a datalogger and do the tagging with computer software.