Abstract: A method for implementing a weather alarm in an outdoor computer includes defining atmospheric-pressure data repeatedly, defining altitude data repeatedly and essentially simultaneously with the atmospheric-pressure data, with the aid of a satellite positioning system, and converting both measured variables into the same measurement unit, either pressure or altitude. The difference between the converted variables is determined and is stored as a reference value, the difference between the converted variables is repeatedly monitored, and when the difference changes by more than a preset limit-value relative to the reference value, a weather alarm is given. Also an apparatus for performing the method.

Abstract: This publication discloses a method and apparatus for implementing a weather alarm in an outdoor computer (10-14). According to the method, atmospheric-pressure data (2) is defined repeatedly, altitude data (1) is defined repeatedly and essentially simultaneously with the atmospheric-pressure data (2), with the aid of a satellite positioning system, and both measured variables are converted into the same measurement unit, either pressure or altitude. According to the invention, the difference (?1) between the converted variables (1 and 2) is determined and is stored as a reference value (?1), the difference (?2-?5) between the converted variables (1, 2) is repeatedly monitored, and when the difference (?2-?5) changes by more than a preset limit-value relative to the reference value (?1), a weather alarm is given.