Recommendation for tracking device
I use a Garmin Forerunner 235 which has these features. The heart rate monitor is built into the back of the watch, rather than using a chest strap which I think the Polar model does. 

It can also connect to bike speed/cadence sensors, your smart phone etc.

A dedicated bike computer like the Garmin Edge 810 is also useful as it adds a map display and route planning.