Just got a Polar CS 200 HRM for Christmas and I love it. But...I have noticed that there may be something wrong with the calibration for the cycle computer. It seems to be about 1/10 of a mile off for each mile. I have a route leaving from my house that I have measured many times with both of my cars and my old $10 walmart/schwinn cycle computer. The first ride I took with it is a 10 mile out and 10 mile back and it came up short on the mileage. I have 700 x 23 tires and I entered the correct code...just wondering if anyone else has come up against this with Polar. Thanks.