Factory Navigation Question.

I bought a used 2015 Tundra, that originally came from Utah. I'm in Michigan.
The navigation system base map is of the Northwest states.
It still shows some data for the Midwest, but I'm told the Northwest base map has much more detail for that area. Then it does for the Midwest.
Anyone know if this is correct? And if so, how do I get the Nav. system updated to the Midwest base map? Or do I just keep using my Garmin and don't worry about it.

 

i don’t believe this is true (unless it’s an aftermarket system)

if there was only one map, road trips would be terrible. I’ve been all over the country and haven’t had an issue.