Going off the Grid

Today we are headed for Big Bend National Park. I suspect we won't have cell phone coverage while we are there. We will be doing what is called " dry camping" or "boon-docking" while staying there. No electrical, water or sewer connections at the campground. We will be charging batteries with my generator. So long story short.....we are going off the grid for a few days. Weather has been great, but at freezing during the night. Forecast is for even warmer temps.