Thanks for the advice. You may also be aware, if you are actually an MD, that there is a big difference in the physiological effects of cold air depending on your level of exertion, with racing events at one extreme of that spectrum, but from your post I'm guessing that you are completely unaware of the amount of recreational activity that takes place at such temperatures without injury.
Theodolite is an excellent app. In the US, the ScenicMap apps are very functional offline, and Topo Maps has the best set of USGS maps that I have found so far. Galileo is good for custom offline map production.