GPS Logging & Photo Geotagging
The basic concept of GPS logging is simple - a small device records where you are every [insert time period] seconds. It does this by working out where you are on Earth in relation to some satellites in space!
Holux M241 GPS Logger
My logger is a Holux M241. There are so many to chose from though, all pretty similar.

As you can see, it’s about the same size as a small robot. This means that it fits nicely into a pocket, or a bag compartment, or a bumbag, or wherever you want to put it. It doesn’t really matter, as long as it can “see” the positioning satellites in the sky.
When you get home you can transfer your GPS log onto your computer. The Holux comes with some clunky software to do it. It does it’s job, but it’s ugly and slightly confusing to start with.
Lightroom Plugin
The main reason I like to log where I am is so I can attach the info to my photos (’geotagging’). I came accross a rather nifty plug in for Lightroom which does this easily. You select the photos you want to geotag, select your GPS log file and hey presto, the plugin geotags all the photos.
The plugin matches up the time you took the photo with a time in the GPS log. Don’t worry if your camera doesn’t match GPS time - you can supply an offset (I worked out the offset by photoing the clock on the GPS device!)
If you don’t have a GPS Logger, you can manually find the location on Google Earth and the plugin will assign it to the selected photo(s).
If you’re interested, you can download the plugin here - you’ll need Adobe Lightroom 2+ to use it.
Flickr
I mainly use Flickr to display my photos (I may have mentioned it once or twice). They have a great feature where you can add photos to a map. This allows me to keep track of where my photos were taken; and also allows other users to browse a map and see what’s about.
Before geotagging, it sometimes took ages to find on the map where the photo was taken and put it there. Flickr/Yahoo don’t have very good aeriel maps in my area so placing things on it was very hit-and-miss.
If you upload a geotagged photo you can add it to a map in just a couple of clicks! Great!
Here are some of the photos I’ve tagged using the workflow mentioned above.
You can view them on the Flickr map here.
Other things to do
There’s other things you can do with the data. You could make a map of where you’ve been on Google Earth.

There are probably other uses, like for jogging/training, but I haven’t found them out yet.
I’m going on holiday in a few days - I can’t wait to try it out. Must take some spare/rechargable batteries though as it seems to munch through them. I wonder what it’ll do on an aeroplane trip ![]()


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