So, can anyone confirm an armstrap HR band which works with the current firmware of the original TomTom Runner?
Best answer by tfarabaugh
My Scosche Rhythm+ works fine with my Runner1, but it is a few years old so maybe Scosche changed something in the underlying code since then. It would be worth reaching out to them and seeing if the can rollback to an earlier firmware build. HR straps are not something TT has tested as far as I know, so there is not a list of compatible devices. And besides the Scosche and Mio there are not a lot of other arm-based straps out there. Your best bet is to buy one from someplace with a good return policy so that if it does not work you can return it.
I hope this helped answer your question. If so, please mark it as a solution so others can look for it if they have the same question.