Abstract: A method and an electronic device for determining the direction of a magnetic field, in which a mobile electronic compass device is used to measure three field vectors of the magnetic field the desired number of times. From each measurement, a data point (p1-p6) is formed in a three-dimensional co-ordinate system, for which measured data points a common reference point (C) is calculated. The location of the device is determined relative to the reference point in said co-ordinate system and the co-ordinates of the reference point obtained are compared to the co-ordinates of at least one previous reference point, and the co-ordinate values of the reference point are calibrated, after which the direction of the magnetic field is indicated with the aid of the reference point.

Abstract: The invention relates to a portable electronic device and method for determining altitude. The device can comprise a satellite-positioning sensor for determining the elevation of the device on the basis of satellite data, a barometric sensor for measuring atmospheric-pressure information and/or an acceleration sensor for measuring acceleration information, and means for determining the altitude reading on the basis of the satellite-based elevation and the atmospheric-pressure and/or acceleration information. According to the invention, the means for determining the altitude reading are arranged to calculate a corrected altitude reading with the aid of the rate of change in elevation determined at least partly on the basis of the elevation determined on a satellite basis and atmospheric-pressure and/or acceleration information. With the aid of the invention, the altitude profile of exercise can be measured precisely.

Abstract: The present invention relates generally to a thin, low thickness snap integrated within or built within a heart rate monitor belt or snap and electrode assebly. The snap can be integrated or built directly in to a heart rate monitor belt. Furthermore, the heart rate monitor belt can be integrated within a textile or garment, for example a compression shirt, sports bra or cycling shorts. The snap can be flushly integrated into the belt or garment such the snap does not take away from the general wearability of the heart rate monitor belt or garment.