navigation update TESLA MODEL S 2018 Owner's Manual 

Predicting Energy Usage
When navigating to a destination, Model S
helps you anticipate your charging needs by
calculating the amount of energy that will
remain when you reach your destination. The
calculation is an estimate based on driving
and environmental factors such as predicted
speed and elevation changes. The touchscreen displays this calculation at the bottom of the
turn-by-turn direction list when you
firstinitiate the navigation route. Thereafter, you
can display it by touching the area at the bottom of the turn-by-turn direction list.
Throughout your route, Model S monitors
energy usage and updates the calculation as
needed. A popup warning displays at the
bottom of the turn-by-turn direction list in
these situations: