Reddit mentions of AGL3080: Amod AGL3080 GPS Data Logger (Windows and Mac Image Software included)

I have used the AMOD GPS Logger and as long as my camera time is accurate merging the log to the images is easy.

If you have an iPhone GPSTrack (about 2 dollars), is a good choice as well. I still use the external logger just because it saves the battery life on my phone and when I hang it off my backpack it is very accurate.

Something like this?

I've never bought a geotagger but AFAIK you just carry that thing with you and it constantly tracks your location into a file. You then use included software to sync your location with your photos based on the time they were taken. It's pretty important that your clock is set right for obvious reasons. You'll still be off by a bit, but you can just enter an offset in whatever software you use.

I just toss my AMOD AGL3080 gps data logger in one of my back pockets when I ride. Mine takes AAA batteries, so you can throw a fresh set in immediately when the others run out of juice. Battery life is at least 12 hours with the rechargable batteries I use. And it's only $70.

Downsides:

• no cadence or heart rate
  
• no data or map while you ride (I actually prefer this)
  
• no plug-and-play driver/software bundled to view routes and graphs
  
  http://www.amazon.com/AGL3080-Logger-Windows-Software-included/dp/B000WO6HJW/ref=pd_cp_e_0

I'm not sure, but I believe I saw a 2 GB memory card with built in GPS that you can use in the camera you already own. Not sure if that's possible, but that's what I thought I saw.

Edit: A quick google search pulls up nothing, but there are a number of devices for less than $100 which you can buy to gather GPS data. Keep them in your pocket and make sure the times are the same on your camera and the device, and when you get home you can link the data.

PS. Watch out for this one, it doesn't seem to be Mac compatible, despite the company's claims.

This is only data I’ve collected; there’s no reference to USGS DEMs or anything like that.

Gory details:

I like walking and carry one of these loggers pretty much everywhere. I dump it into a postgres database with 3 million rows so far.

To make this visualization, I wrote a stupid little python script that just generates a bunch of "select avg(ele) from points where lat <= %s" ..., colorizes them (one loop of the color wheel per 128 meters) and uses PIL to draw an image. For the big one, this was 4 million queries and took about half an hour. It’s not clever, but it’s effective.