The barometric altimeters that are used in some of our most popular heart rate monitors are very accurate, pressure sensing devices. They calculate altitude based on variations in air pressure. They rely on an accurate base reference altitude to be entered in to the unit prior to a training session. This way, the unit will give an accurate, absolute, altitude throughout the session.

If there is a severe change in weather over the forthcoming hours, then the outside barometric pressure will change. This change in barometric pressure, may be seen as a change in altitude. As an example: If the user set the reference altitude to 100m and then left the watch on the desk for 1 week, it would show altitude changes due to changes in barometric pressure.

These devices will give an accurate trend to ascent and descent throughout a session, however, for absolute altitude measurement, they rely on regular reference to known data points. Please be aware of this and refer to user manual before using your new device.

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