I have a couple of vehicles with factory gps, (large screens) and I also have a Garmin Nuvi with a small screen that I use when I want good directions. The factory automotive units are pretty sorry. I have the 7 inch Magellan and a 7 inch Garmin that I use in my MH. The spoken instructions are good until you get into major cities and need to see lane information, then you need the largest screen that you can get. The small screens are ok in your Nissan, a foot from your face, but stretch that sucker out there 3 feet and with old, tired eyes, it's a problem. I have a Ford dually with factory nav (worthless) and I have no problem using the 7 inch Garmin mounted in the middle of the dash. In the case of gps, bigger is better and a person of average height should have no problem seeing over the gps mounted on top of their dash.
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