A few years ago I took a surveying class and we had an exercise on using a compass and counting paces to do preliminary work. There was some discussion about keeping track of the count over long distances and I showed the teacher how to make a pace counter with a piece of string and some beads. I told him that this was how the Army Rangers were taught to do dead reckoning. He asked why would they use a compass and string of beads when a GPS is so much better. I replied that a compass and pace counter was cheap and easy, could be used in the dark, was difficult to break, and was almost foolproof. I also added that I believed that a GPS transmitter was of low wattage and could be easily jammmed or interfered with, maybe with a local transmitter. Here’s my question, if I had a position that I wanted defend, could I block or otherwise make a GPS receiver useless within say a five mile diameter of my position?
Any body miss me?