[time-nuts] GPS altitude somewhat wrong?

Angus not.again at btinternet.com
Thu Jun 9 03:05:29 EDT 2016

I've had that query before too, but in that case it turned out to be
that by default some receivers/software report Mean Sea Level and
others Height Above Ellipsoid, or both.


On Wed, 8 Jun 2016 20:33:58 +0000, you wrote:

>I have just installed a Thunderbolt here to get our time and frequency equipment all on the same page.
>As I was looking at the display on Lady Heather, I was noticing that the GPS altitude seems rather wrong.
>We are in Boulder CO, which is nominally 5430' and the antenna is about 20' off the ground.
>The display (near overdetermined position) reads 1589.72991 meters or 5216 and change in feet.
>Altitude is a big deal around here. :)
>I suppose 214' isn't that outrageous, but it does bring me to a question:
>How accurate is the altitude number really?

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