GPS units for my grandparents

My apologies if this isn't the place to do this, but I'm out of ideas. I'm moving my grandparents in with me so I can take care of them. They have lived in their small town (&lt:10,000 people) for nearly their entire lives and they will be moving to a large city. The size, amount of traffic, and being in a new place terrifies them and they are VERY hesitant about driving, fearing they will get lost, get into an accident, etc.

So, I need to find a good GPS unit to put into their car that above all is SUPER easy to operate. They literally don't know how to turn a computer on, double click (have to be told to every time), etc. The unit will need to be VERY easy to read (no vision problems, but I don't want them having to stare at it to figure out what's going on while driving), turn on with the car, always stay on while driving, automatically shut down when the car turns off (they won't remember to charge it at all), and have a few buttons (digital is fine but needs to be on startup screen) for home, church, a common place or two, and a super simple search function. It would be great to have lane guidance so they don't have to try to cut across 3 lanes of traffic for their exit. Anything else anyone can think of would be great.

I will be driving them around much of the time, but while I'm at work, I don't want them to feel trapped at home as moving from their home and hometown for the past decades is already quite a stressful time for them. I want to make them feel as comfortable and stress-free as I can while enabling them to maintain their freedom. There's quite a few things around me, so they wouldn't be making any huge trips.

I sincerely appreciate the help in trying to make my grandparents as happy as possible.