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Three advantages I've found for the "portable" vs a "built in" GPS. First, you can place the portable on the dash at roughly eye level and the absolute best place for an instantaneous glance to check next turn direction or distance to go to the turn. More difficult viewing with the "built in". Got to look "down" somewhat. Sort of a safety issue in my mind. Second, we've taken the Garmin with us on a couple of "vacation from vacation" trips and used it in our rental car..also when the TV is down for whatever maintenance. Last, it is very simple to update the software and after a year or so, the data base. In the same context, you can do the route planning in the comfort of the rig and take it to the TV, programmed, when it is trip day.
Think I'll stay with the portable when the next vehicle buying opportunity comes along..
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