The Nav map on the 17" touchscreen seems to get drawn directly from Google, with little or no
map (other than the currently displayed portion of the map) actually stored in the Tesla.
If one loses connectivity to the Internet, you have to make do with whatever map portion
was last showing. So, one "trick", if you know that you are going to be entering an area
with no Internet coverage: Manually zoom out to cover the entire area, and the "car" icon
(the Wedge) will move around, indicating your car's position on the large-scale "fixed" map.
Also, set up your route, if any, before manually zooming the map and losing thr Internet.
Meanwhile, the separate GPS Nav system, usually displayed on the left end of the "dashboard"
display, shows a different map, apparently one that is older, and entirely contained in the car.
It appears to me that the details of the route, from the "Current Location" to the "Next Stop",
is normally calculated by this little Nav unit, using its map, even when its older map does not
agree with the newer Google-sourced map. The route that is drawn over the Google map
sometimes uses roads that are no longer there, and ignores new roads. The list of turns
seems to follow the old-map route. Very confusing at times.
So, is there any way to update the in-car "old" map?
Presumably there must be provisions for updating this map, right?