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A comment on Boeing 787 Reaches 801 MPH as a Jet Stream Packs Record-Breaking Speeds. Parent comment

Re:Boeing 787 Reaches 801 MPH as a Jet Stream Packs Record-B... by glitchc on Tuesday February 19, 2019 @11:54PM (#19205608)
Ground speed is measured by GPS on modern aircraft.
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Re:Boeing 787 Reaches 801 MPH as a Jet Stream Packs Record-B... by dzhiurgis on Thursday February 21, 2019 @06:52AM (#19216158)
Which is probably measured in it's trajectory and then recalculated as ground speed, which is sea level? Wonder if it accounts for sea levers being higher at certain parts of planet?
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