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[GS_TECH01]

Please look at the GGA output on pages 1-2 and you will see the Ellipsoid altitude: http://www.usglobalsat.com/store/downloads/NMEA_commands.pdf
 
If you switch the mode to SiRF Binary Protocol, you can also obtain the Ellipsoid Altitude:
http://www.google.com/url?sa=t&source=web&cd=1&ved=0CBYQFjAA&url=http%3A%2F%2Fgpsd.googlecode.com%2Ffiles%2FSiRF-SiRF-v2_3.pdf&rct=j&q=sirf%20binary%20protocol&ei=yKHeTYCLBJKisAOGuIyTBw&usg=AFQjCNG8WpUohNYclzsaCHRpPJofK5qwJQ&sig2=sVnn42fbHhXw7adDV5rzig&cad=rja