Hi all ,
i find some information about altitude given by a GPS.
The correction is contained in the sentence $GPGGA as follow:
**********************************
Bonjour,
Si vous prenez la phrase NMEA $GPGGA d'un GPS vous aurez l'indication de
correction d'altitude( en rouge ci-dessous et souligné) à effectuer ce qui
correspond à l'explication de Roland, mais la plus part des GPS normalement
tiennent compte de cela et affiche la bonne altitude, sur mon garmin je n'ai
rarement plus de 5 à 10 m d'écart avec la réalité
$GPGGA,065110.000,4544.5047,N,00438.9883,E,1,07,1.2,472.7,M,48.5,M,,0000*56
Robert F1GHO
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The indication is in red :48.5, after the 11th comma.
73
Alain
F4GBC
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Friday, January 15, 2010 1:35 AM
Subject: Re: [time-nuts] Tbolt altitude error
No,
one is reporting in MSL, the other in GPS height.
There is about a 30m difference between the two here in Santa Clara
county, CA, similar to what you are seeing.
bye,
Said
In a message dated 1/14/2010 15:23:09 Pacific Standard Time,
[email protected] writes:
Depends on satellite geometry. Where they both tracking same satellites?
Rob K
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of John Green
Sent: 14 January 2010 9:36 PM
To: [email protected]
Subject: Re: [time-nuts] Tbolt altitude error
I had a Tbolt and a Z3801 both fed from the same antenna and they
indicated
26 meters differenence in altitude. The 3801 seemed closer to right. If
geoid error were the cause, it seems that both would indicate about the
same.
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