In older Ram Navigation Maps
If you have the radio that came with NAV from the factory
There is no extra charges
UNTIL, after 3 or 4 years, you may decide to do some traveling, then you may want to get the newer maps, then they charge as much as $149 plus tax
Most people just buy a Garmin GPS with FREE Lifetime Maps & Traffic,
Do not be fooled by advertisements,
the new maps do not show up every year, that is why i mentioned updating map every 3 or 4 years.
Otherwise you just get maps of where the coffee shops, theaters, malls & that kind of things have moved to in the past year.
For that kind of information, you get up to date info on your Smart Phone