I noticed on the new Z-Sprays they have Garmin GPS for speed. Anyone know the accuracy of this little unit? It is called a Garmin Forerunner 101. I looked on the web and you can get the exact GPS unit for about $70-80. You can track your time on each lawn from start to finish, speed and check and distance etc. Is anyone thinking of adding this to their ride-on unit? This may sound stupid.....but I was even wondering about on larger properties about using it for estimating lawns? You can wear it on your wrist also. Just wondering about this as it sucks to push a wheel over larger acreages that are all cut up.