Patent ID: 8171788

Claim:
Portable electronic device ( 20 ) comprising an atmospheric-pressure sensor ( 22 ) for measuring atmospheric pressure, a memory unit ( 23 ) for recording atmospheric pressures recorded at several moments in time, a display unit ( 25 ), and a control unit ( 21 ) for displaying simultaneously the magnitudes of atmospheric pressures recorded at several times as a graph on the display unit, which comprises adjacent atmospheric-pressure indicators ( 12 ) corresponding to several different moments in time, characterized in that the display unit ( 25 ) is arranged to display an atmospheric-pressure indicator ( 14 ), which comprises at least one line at a slope relative to the main axes of the graph and arranged on the graph, and the control unit ( 21 ) is arranged to scale the atmospheric-pressure indicators ( 12 ) relative to the measured atmospheric pressure in such a way that a rate of change in the measured atmospheric pressure, of the magnitude of a predefined constant, will cause the atmospheric-pressure indicators ( 12 ) to be set on the graph parallel to the said sloping line.