We have the Rand McNally 5510 system and I find it works very well. I found the 5" screen is plenty large for me, and the warnings of turns and other issues up ahead are quite helpful. I recommend the Ran McNally System.
The only thing is that it has a speed monitor which reminds the driver that he maybe going a little to quickly down the road. This has the immediate effect of alerting the Co-pilot who once again reminds the pilot he is going too fast. Makes for some interesting in cab discussions.
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