I am new to long distance running. About 10 years ago I biked often and I use a polar system and its software. For some reasons I stopped biking for years and of course all my HR system has gone. About a month ago I started jogging hoping to take part in some 10k runs and finally leads to a marathon. To play safe, I purchase my HR system again. Garmin Forerunner 310XT is what I have now. Its ANT+ system is horrible. I can never install the driver into my desktop so each time I need to use my net-book to get the data and transfer to my desktop. And from this forum I discovered SportTrack is a better software than Garmin's Training Centre. I am now use ST3 and an added-on Overlay. I like ST3 because it support Google Map directly.