We use the Rand MC Nutty now but have the Garmin for a backup. The programing must be done in china and using old Maps from the 1700s up through 1945.
Even updated every little bit they both leave out sections of Interstate and other roads built in the 70s forward. Old cow paths, Indian Fiords, I kid you not, Stage coach road, and goat paths.
Invariably they direct you through some towns and to places to eat that have all been out of business many years. The new chains may be on the Rand but we haven't looked.
One of my favorites was two years ago being directed to make a u turn and go back about ten miles, turn right and many goat paths back out on the same road we were originally on two miles down the road.
Then there was the directions to turn right along a big crosswalk and into Lake Michigan and back along the shore underwater.