The altitude is measured via the pressure sensor. The barometric pressure depends on the altitude. The AlpinerX processor measure the barometric pressure and computes the actual altitude.
The pressure also depends on the weather conditions, this is why the altitude can change with the weather conditions. For this reason, the altitude must be calibrated from time to time.
In the AlpinerX application, in the "my watch" page, "calibration" menu, you can calibrate the altitude. If the GPS of the phone is ON and gets a good altitude position, it will propose a value. Enter the actual altitude of your position to calibrate the watch altitude.
In the menu "general", you can turn ON "auto altitude calibration". The phone will regularly read the phone GPS altitude and send it to the watch as a calibration value.
In the AlpinerX application, in the "my watch" page, "calibration" menu, you can calibrate the pressure. Enter the actual pressure of your position to calibrate the watch with a reference pressure.
To work properly, the compass of your AlpinerX must be calibrated once.
To do so, go to "my watch" page, "calibration", "compass calibration" and follow the procedure. You must turn the watch horizontally a full turn.
For a successful calibration, follow the good practice rules:
Tip!!: You can keep your watch on your wrist, keep it horizontal (in the same position as if you are watching the time) and make one full turn on yourself.
The AlpinerX has a UV sensor under the dial.
UV are the Ultra-Violet rays of the sun light, outside of the visible spectrum. At high exposure, the UV rays can damage the skin and increase risks of skin disease like cancer.
The UV index is a classification, from 1 to 12, of the intensity of the UV in the sunlight:
The sensor will indicate the temperature with the following allowance: +/- 2 degC max (typical +/-1 degC)
The sensor will indicate the index with the following allowance: +/-1 UV index
Altimeter & Barometer
The ATM pressure will change depending on weather conditions. The altitude is calculated thanks to this pressure. A change in altitude equals a change in the ATM pressure measurement.