R.B.
A.,
I had one for a long time and agree that the calibration is the most important part. I put mine on a string that I would put around my waist but only put through the back and side belt loops. That way I could get a little sag action to get it below my stomach enough that the extra motion wasn't a big deal. I also borrowed on e of those wheely things that they use to measure distances and measured my favorite walking path, just to make sure that I had calibrated correctly. You could do the same with your car and measure an exact half mile and then walk it to see if you are calibrating right. You walk 1/2 mile from home and check then reset and walk the 1/2 mile back home and double check. Good luck walking. Just getting started is half the battle.