Years ago I bought a Garmin. I now have a fancy Nav system in my truck. Both are garbage compared with my cellphone and Google maps.
Maps gives me up to date traffic information which is often invaluable and can save long delays. With Maps, I can search for any location. Toward the end of a travel day, I can search for Walmart supercenters, rest stops, campgrounds, dump stations. and truck stops. I can search for more obscure locations. Again, all of the information is current and reliable.
Someone mentioned that the cellphone screens are too small. Actually I have a fairly large cellphone and the screen is not that much smaller than my built in Nav system and it is about the same as my older Garmin. In any case you should never drive while reading the maps. That is distracted driving and way too dangerous. Unless I am stopped I follow the voice commands.