The mountable gadget I'd like to see

[j3gq_imp]

Why smart phones don’t work that well on the m/c has been discussed plenty. Display in sunlight, battery time etc. But wrt Tom’s request, the smartphones simply lack the necessary sensors. The solution is a separate sensor pack you put anywhere (in your backpack) and link it via BT to your phone. Next you need an app to show all the data communicated. As far as I remember, an app called Lokus can do this for you, so you get maps, speed and all the data from the sensor pack on one screen. If you can’t find such black box for m/c, look in the hiking section.