Provides reasonable tracking, great when used with Google maps. Rechargeable batteries (1AA cell) do not last long... a few hours, alkaline last approx 10 or so hours. Expensive unit... so that when combined with other components is significantly more $ than Garmin units. The RS800 is however a versatile unit and the GPS component plays an important part in that performance. GPS unit does not appear as precise/sensitive as some other GPS receivers. Get more detail about Polar G3 GPS Speed and Distance Sensor Set.
