I don't know nearly enough about this stuff to say for certain what the possibilities are.
Doesn't that device seem like something that could one day be developed to pick up ANT+ transmissions?
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Its all possible and probably not that hard for most of the major manufacturers out there to integrate it into current products. Might be a popular item with triathletes, but I find devices with larger screens to be more useful, with the PT being about as small of a screen that is still easy to uses.