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In April 2020, I presented a talk on understanding GPS in contested environments. Topics included the following:Understanding GPS position error, dilution of precision and user range errors, physical and radio visibility, terrain heights and field results, mitigation techniques and alternative navigation technologies.

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I used to write stories. I haven't had the desire to write in quite a while, but I feel it starting to come back. Hopefully these won't be the last ones I'll write.

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When you turn on your GPS receiver - what happens? Well, lots of stuff. But primarily, GPS receivers work in a two stage process: 1) Look for available satellites to track 2) Do everything else. In this article, I want to focus on step 1, we'll get to step 2 later.

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The day Dr. David Dao was dragged off of a United plane so United employees could get to their next destination was significant for another, possibly longer-lived reason that the sheer brutality it portrayed.