[time-nuts] Subject: Leica L1 GPS Choke Ring Antenna

[Didier Juges]

Remember that coordinates are absolute, but altitude is relative to the ground. GPS knows your distance to the center of the earth, but it can only calculate your altitude if it knows where the ground or sea is at your location. There are several different earth models GPS receivers use to calculate that, none of them are perfect. In addition, because of the orientation of the SATs orbits, altitude is the one coordinate which is the least accurately calculated.

Didier

"Mark C. Stephens" <marks at non-stop.com.au> wrote:
>Scotty, need some help figuring out my elevation.
>
>
>I noticed all the smartclocks are surveying wrong.
>
>The only one correct is the thunderbolt.
>
>Interesting.
>
>Once I figure out the string to enter the correct co-ords into the
>Z38xx's  but I am still troubled by the elevation variable.
>
>
>-marki
>
>-----Original Message-----
>From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>Behalf Of mc0fred
>Sent: Friday, 12 July 2013 7:06 PM
>To: time-nuts at febo.com
>Subject: [time-nuts] Subject: Leica L1 GPS Choke Ring Antenna
>
>G'Day Mark,
>
>Yes as suggested, Gal. pipe works for me, you can get short threaded
>lengths at Bunnings. (Just like the plastic Ag. pipe you are using now.
>A few "U Clamps" and you in business.
>
>Regards Scott
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