The small and compact ADC units with a number of important functions keep track of altitude, wind speed, humidity, wind chill factor and other information, that can help you on your expedition. They can even wake you from a deep sleep if you wish. Some models save information that you can then transfer to a computer.
A well-planned journey begins in the comfort of your own home and leaves you time to enjoy the trip once you are actually out in the wilderness. With a map measurer your trip can be planned in detail, to avoid surprises on the way. Daily stages linked together with the number of days of the trip, should be equivalent to the distance you want to cover, to reach your goal in time.