Give the Karoo 2 a try if you require a tough outdoor computational system with precise position tracking, biometric sensor recording, and flawless mapping.
They are currently solely developing devices to assist cyclists, but they are quite enthused about the possible future applications.
When you load a GPX track into your Karoo 2, it will plot a route for you through rivers, through snowstorms, or around your local backcountry trails. Connect the device to any of your biometric sensors and keep track of your progress. Karoo 2 allows you to exchange and make plans on routes.