I have this SparkFun GP-20U7 GPS Receiver. It seems to work pretty well. I'm changing around my approach to the autonomous robot, and now I need access to the PPS (Pulse-Per-Second) functionality of the unit. The PPS pad isn't broken out on this device - it's under a pile of red goop you have to scrape off, and is actually part of an unpopulated LED circuit. It's not immediately clear (to me, anyway) how to wire it up to a...