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Hi cbisbeeThis was exactly the question that led me to the forums today. When I searched for CLLocation and altitude I found your Post. I am working on an aviation app right now and I also need to exactly know what's the reference for the altitude. In the CLLocation documentation I read:"Positive values indicate altitudes above sea level. Negative values indicate altitudes below sea level."Despite the fact that the word "mean" is missing (Mean Sea Level MSL) to me it also looks like Geoidal height. For me any more precise information would also be appreciated.