Just this morning had a nice 60km spin with rollerskates, and it came to me what's a badly needed OH functionality: interface to the different HRM belts from various manufacturers!

Some belts, mainly the ones meant to use with a smartphone running SportsTracker use normal BlueTooth or BlueTooth-LowEnergy connection, but the belts meant for integrated wrist-computers use proprietary RF connection. Now wouldn't it be cool to have an other half that could use ALL and ANY HRM's from Polar, Suunto and Garmin.

If that turns out to be too much, maybe suggesting to manufacturers that they make OH's compatible with their belt solution, coming packed with the SW to run on the device.