I ran into a wiki description of GPS using WGS84 a couple days ago. It included a mention of ESEC and it was something like: Earth Static, Earth Centric. I think I was following a link about the Z3801A.

It referred to the fact that lat-lon is referenced to a static grid on the Earth and doesn't change as the Earth rotates on its axis or around the sun. Earth static and Earth centric.

73, Doug Reed, N0NAS.

Christoph Kopetzky wrote:
But now I am cleaning my devices and I am reading the label
"ESEC" again on the back.
So the question comes up again, what is ESEC?
Google knows nothing about the signal or protocol...

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