Nico de Haen wrote: > This calculator gives only the geoid height, not the height of the > surface above sea level. > (For Mount Helen, 46°11'49.01"N, 122°10'35.45"W it shows 4.15 m...) > > Any other ideas? > Yes, I wrote it's geoid calculator. Cheers -- Mateusz Łoskot http://mateusz.loskot.net