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- Absolute Altimeter shows your current altitude above sea level. This is calculated from the local pressure (sourced from the device) and the local sea pressure / temperature.- Local sea-level pressure and temperature are automatically downloaded for current location. Alternatively, they can be set manually if desired.- Pressure, temperature and height units can be changed on either Watch or iPhone, with changes automatically transferred to other device.- Apple Watch will derive local pressure from the iPhone when connected for a more accurate reading. However, it can also obtain its own local pressure, providing a slightly less accurate reading (still within a few ft).