I use the Navigon App and I downloaded about 4-5 states maps that I use the most. Works great.
I had a few Garmin standalone navigation car units but havent used them for years and dont really know where I stored them last.
Plugging them in and out each time and hiding them so people wont smash my windows to steal them when parked was not fun and they took a while to lock in satellite signal and had to keep them plugged in to the outlet to charge while driving.
I dont miss those days
Oh yes, I do worry about ppl stealing them lol. But my reception is instant tho