Polar OwnZone is a feature obtainable on a lot of their Heart Rate Monitor devices, but what is OwnZone??, why should I use OwnZone?, there is an write-up inteneded as a aide to get you started and all being well try the OwnZone system on your Polar watch.
eHeartRateMonitor.co.uk has an report on what the Polar OwnZone is for and why you could use it. It describes that the OwnZone system constructed into Polar Heart Rate Monitors sets your heart rate zones in accordance with your resting heart rate at the begining, taking into your personal elements currently programmed into the watch.