Triple Sensor

The altimeter measures the exact altitude of your current position using data from a highly sensitive air pressure sensor. As soon as the air pressure changes even slightly, the altimeter also registers a change in altitude, so calibrating your PRO TREK is best done at a location where you know the exact altitude. The watch adds up the number of meters climbed — meaning that you can see at a glance just how high you've climbed once you finish your hike.

In this sensor, a thin silicon layer is stretched over a hollow vacuum container. This layer responds to changes in ambient pressure by expanding or contracting. Resistances measure the changes and convert the values into altitude or air pressure values. The heat sensor reacts to the slightest changes in temperature. These changes will be evaluated by a microprocessor and displayed on the watch in the form of temperature values.

A directional sensor determines the direction of magnetic north and the bearing and displays this information in digital form. If you use a map when you are hiking, you can place it next to your PRO TREK, align it accordingly and orient yourself perfectly. The magnetic declination refers to the angle between magnetic north and true north. The angle of declination is primarily determined by the fluctuations in the earth's magnetic field — closer to the poles, the different positions of the geographical and magnetic north are also used. You can switch the display on the watch between magnetic and true north in order to correct your orientation.