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Re: [Paparazzi-devel] GPS accuracy

From: Mario Pisa
Subject: Re: [Paparazzi-devel] GPS accuracy
Date: Wed, 4 Jun 2008 15:54:33 +0200

GARMIN only send data in WGS84 independently of the configuration what you put in settings device.
Best regards,
On 5/31/08, Dirk-Willem van Gulik <address@hidden> wrote:

On Fri, 30 May 2008, Haiyang Chao wrote:

On Fri, May 30, 2008 at 8:38 PM, Mohammad Ali Haji Pour <address@hidden> wrote:

     Yes, that is what I meant. Usually the last 4 decimal points of lat and long that I
     am getting from the GARMIN hand-held receiver is different from what I get by
     u-blox receiever.

Did u check Pacc, Sacc, NumSV in messages or just GPS part in the GCS?
NubSV stands for satellite numbers. Generally u must have more than 4 satellite to get a good

This sounds fairly systematic - so one thing to check is the DATUM - are both receivers using WGS84 or, even better, the local DATUM ?

Also - do know that for some parts of the world (e.g. the Netherlands) - the geo-correction of google is incredibly poor - yielding 100's of meters delta's at sea level due to both datum-errors and conversion errors. (e.g. the WGS84 coordinate given for a pixel in the image is a) very far from the actual coordinate of that pixel projected onto the geoid used and b) very far from a WGS84 measurement with a proper GPS at that location relative to the datum.).



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