I've got a Polar Coach with the sonic link to download your laps onto a computer. I struggle for 2 years to get this thing working, but I'm still struggling. I download the software, upgrade to the new version and load the patch. Here's my problem (1) I view my training and it indicate a km/h section. Do I need to buy a transponder to measure the speed? (2) Cant see any reports or graphs....Is the following available for this HRM. (speed sensor, cadence meter or altitude meter) as in the S710. or is this HRM more suitable for athletes than cyclist.