I have the Magellan Roadmate 700. It is basically the same unit you get if you've ever rented a car from Hertz and had the Hertz Neverlost in the car. It's great. Portables are great. You can obviously take them with you in whatever car you happen to be driving. Better than those $2,000 built in NAV systems.
Now-a-days I believe they all have voice guidance which is key. You don't want to have to constantly be looking at the map screen.
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