There is a facility on http://myithlete.com/ that will allow me to do it. It retails about £30. At the moment its only available on the iphone but should be available on other phones this summer
No probs jeepers, In between my running sessions I do training on a indoor spinning bike. Info from Monitors for spinning bikes is useless, mainly because you can go further and faster by using less resistence, which is easier. Therefore the only true measure of a indoor bike workout is your AVG HR at the end. If I could see my AVG HR at all times I would be able to tell if I was on course or behind for a good workout. Without this function I have to go hell for leather and hope I have beat my AVG,