One advantage of GPS systems if you have DirecTV or Dish Network is you can get the exact longitude and latitude of where you are. It is much more acturate than using zip code for this info. Campgrounds are often on the outskirts of cities and the zip code centers on the main part of a city. I tested it at our stick house because we are about 6 miles from downtown. There was a difference, about the amount we had to move the DirecTV when we set it up.
Happy trails........................
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