I love cat based electronic projects. I've been trying for the last few weeks to come up with a real time GPS tracker, but I just can't seem to finalize the parts list. All gps chips I know of are too big and tend to overheat.
story: http://www.wired.com/2014/08/how-to-use-your-cat-to-hack-you...
Not sure how you could _not_ find small gps units nowadays. Have a look here, for example: https://www.sparkfun.com/categories/17