That is a question that used to be much more common than it is today. Loran stands for Long Range Navigation. It was based on radio waves broadcast from towers placed around the country and eventually the world. The system was largely replaced when the government made Global Positioning Satellite data to the general public.
The problem that conventional radio based navigation systems was primarily the shape of the waves. They overlapped but they were all centered at the tower that produced them in the first place. That meant that a lot of the positions were not rectangles. In fact very few of them were rectangles. You can see the problem here.
There are a few pieces of commercial software for doing the job, but the best way we've found to do it is on a free site from NOAA lets you enter the input values and gives accurate GPS coordinates.
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