[AltimeterGuy]

The X6HR should work with your original Polar M52 if it's not a digitally coded belt. My recollection on the Advizor was that it would work with a portion of the Polar digitally coded belts, but not all. I wish I had a more definative answer for you. I also wish the X6 & X6HR included a USB cable or adapter too. I had to buy a Keyspan Serial-to-USB adapter to use the SAM software with my X6.

AltimterGuy

	Suunto X6 HR - Click for more info Just when you thought a sports watch couldn't get any better, Suunto introduces the X6 HR, X6 HRM and X6-HRT. These are truly the next generation in sports watches, packed with all of the technology that Suunto enthusiasts have been craving. Designed for Cross Sports applications, the X6 writstops are functionally very similar to the Suunto X6 - but with the added benefits of a heart rate monitor.

	Suunto X6 - Click for more info Just when you thought a sports watch couldn't get any better, Suunto introduces the X6 HR, X6 HRM and X6-HRT. These are truly the next generation in sports watches, packed with all of the technology that Suunto enthusiasts have been craving. Designed for Cross Sports applications, the X6 writstops are functionally very similar to the Suunto X6 - but with the added benefits of a heart rate monitor.

	Suunto Advizor - Click for more info The Suunto Advizor - featuring a Heart Rate Monitor using Suunto's proprietary HR technology - simultaneously shows your heart rate, altitude, and vertical ascent/descent data. The Advizor memory stores your total training time and your maximum, minimum and average heart rate during training - plus your time spent in / above / below your pre-set target heart rate. There's even an audible alarm to alert the user when your upper or lower heart rate limits have been exceeded.