Hi

Yes, the Polar 625X is compatible with a MAC, unfortunately not right out of the box :mad: You need to buy third party software called iSMARTtrain http://www.ismarttrain.com/ you can download a trial version on their website. Besides the software you need the Infrared Serial Interface from Polar and a Serial to USB interface from Keyspan to hook it up to the MAC. Polar makes also an USB version but I am not sure if it works with a MAC something with IR protocol issues. Check the forum on the iSMARTtrain website for any updates on that one. I've been using the software for one year know and it works great, I think you can do more with the original software from Polar that came with the watch like programming interval training and then downloading them into the watch, I have no idea how this works since I only own a MAC ;)

Robert