My thought is that the ones that give you detailed audible directions are the best. At my age it's hard to look down at a map (paper, electronic, or otherwise) and back at the road quickly. My eyes just don't refocus that fast anymore. Don't most of them have audible directions as well as visual?

I have a friend who is a pilot. He takes his in the plane with him, too. Says it works great. I think it's a C550.

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OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 90,000 miles
2002 C320 Wagon 122,000 miles
2016 AMG GTS 12,000 miles