Altimeter (general information)
- The built-in altimeter uses a pressure sensor to measure the current air pressure.
- The measured air pressure is then used to provide an "estimate" of the current altitude.
- The electronic mechanism in the watch is pre-programmed with "ISA values" ("International Standard Atmosphere") used to convert pressure values into altitude values. In simple terms, this means that a formula inside the mechanism converts all pressure values into a specific altitude.
- The air pressure and temperature generally become lower as the altitude increases. The altitude is measured based on the ISA values, which define the connection between altitude, air pressure and temperature.
The electronic mechanism "estimates" the altitude based on the air pressure.
This means that the altitude shown in the display may vary in the same place if the air pressure changes.