Just eyeballing it, I expect they were using relative strengths of land-based radio signals to determinate location and heading.
Just eyeballing it, I expect they were using relative strengths of land-based radio signals to determinate location and heading.
The seller indicated it was one of many in a triangulation system. Take that as you will.
The seller indicated it was one of many in a triangulation system. Take that as you will.
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