I have owned several Garmin watches and Garmin navigation systems. I have promotes the 310XT watch to several friends as well. I am so disappointed in this equipment and also GArmins customer service. What a joke. How can a company sell an item worth $400.00 that doesnt work!? there are dozens of complaints on line discussing the inaccuracies of the HR monitor system...i have tried so hard to buy a new one. i dont even want a free replacement even though the thing never worked right since the first week...i cant even find a place to sell me the new chest strap and sensor. At least i have a Blog which recieves serveral thousand hits a day so i am now going to discourage as many people as possable from buying Garmin watches...seriously a crappy company as far as service goes...and BTW, if you are a co your size then get a web site that acctually recognizes canada