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PostPosted: Wed Sep 05, 2007 4:05 am 
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Joined: Fri Aug 10, 2007 10:39 am
Posts: 192
Location: Putrajaya, MY
GPS: Garmin GPS 60 CSx
Hi,

does anyone know how to calibrate a GPS receiver when one is near this monument located at Jupem (Malaysian Govt Mapping Department) in KL?

I've been near the monument: there was a commemorative plate about which VIP officiated its opening but no technical data whatsoever! :mrgreen:

topoguy

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PostPosted: Wed Sep 05, 2007 7:35 am 
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Firstly, it's not much point calibrating cause the height error is actually caused by atmospheric conditions and satellite constellation, both which are variables at different times and places.

Secondly, the heights from JUPEM are based on MSL (mean sea level) whereas GPS heights are based on the WGS84 Ellipsoid.

You can calibrate a unit like the 60CSx but you're actually calibrating the internal barometer, not the actual GPS readings. I believe the unit will actually auto calibrate itself everytime it's switched on.


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PostPosted: Thu Sep 06, 2007 8:17 pm 
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Joined: Mon Apr 18, 2005 12:00 am
Posts: 3362
Location: Sabah & Sarawak
GPS: Garmin 10x, GPSmap78s (now become a lemon) & etrex Vista HCx
declan wrote:
Firstly, it's not much point calibrating cause the height error is actually caused by atmospheric conditions and satellite constellation, both which are variables at different times and places.

Secondly, the heights from JUPEM are based on MSL (mean sea level) whereas GPS heights are based on the WGS84 Ellipsoid.

You can calibrate a unit like the 60CSx but you're actually calibrating the internal barometer, not the actual GPS readings. I believe the unit will actually auto calibrate itself everytime it's switched on.


Yes declan is correct.

The GPS height reading only auto calibrate if you had selected that option.


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