Good Work I read David Esler’s article “GPS Vulnerabilities” (March 2019) with much interest. This is a topic that I, as an aircraft consultant, have wanted to learn more about since the massive expansion of the use of the GPS system.  His article answered all of my questions. It has been my experience that Mr. Esler always researches his topics very thoroughly and expertly and presents the information in a very well written manner. Kudos and thanks to ...


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