The link at Make magazine (issue #37)that contains the actual description to build and code the cat tracker is gone/broken.  I've written Make and they say they are working on it, but that was a few weeks ago.  Did anyone archive those files, and can you make them available ?
I've got to track my kitty!
Thanks!

I can't track down the full article, but we do have the original code for the JF2 chipset: https://codebender.cc/sketch:37450

Along with updated code if your GPS board has the SE868 V2 chipset on it: https://codebender.cc/sketch:60928

Hope this helps, and thanks for letting us know the Make link isn't up.