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I have the following NMEA output by Holux M-241 GPS receiver:

$GPGGA,144014.000,2227.0987,N,11410.1382,E,2,6,1.67,32.6,M,-1.3,M,0000,0000*7B

I know that WGS84 height is higher than geoid height 1.3 meter. But how can I know that which geoid model it is using?

Also, is it a database stored in the GPS chip for geoid height and WGS84 height conversion?

  • by default, the GPS height is usually given relatively to WGS 84. What makes you think this is not the case here ? – radouxju Jan 27 '14 at 8:05
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    In the above NMEA response, there are two heights. One is ellipsoid height, which is the height you mentioned. One is geoid height, which is calculated from a function of coordinates and ellipsoid height. What I mean is the geoid height. – Harold Chan Jan 27 '14 at 8:11

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