[glassdoctor]

That's the one I have... they are nice little gadgets. There is a newer one wiht color screen etc I think... but I'm not fully up to speed on what's out now.

For r/c car use you might want to check out he smaller ones like the garmin gecko... if one of those has the waas capability then I would pick that for it's size. The waas just allows it to be a little more accurate sometimes. For speed measurements it's not critical though... but it can make a differenece if you need to find a buried treasure and not dig too big a hole... :)