Как пользоваться барометрическим альтиметром?

7. Altimeter & Barometer Mode

7.1 How Altimeter & Barometer work
Altimeter & barometer is measured base on one sensor which can measures air pressure. Knowing the work method of altimeter and barometer, it help you using this unit more accurately.
Caution: please ensure there is no dirty or sand near sensor. Please don't insert anything into the hole of the sensor.

7.1.1 Getting correct readings
Under barometer mode, you can get current air pressure.
If you want to get accuracy sea level air pressure, please input accuracy sea level altitude base on your location. Sea level altitude can be checked on some topographic maps.
If you want to get accuracy sea level altitude, please input accuracy sea level air pressure base on your location. Sea level air pressure can be checked on some weather news paper or website.
Weather changing can influence altitude measurement. When weather change high frequency, it’s better to calibrate sea level altitude or sea level air pressure. Especially calibrate when start to climbing.

7.1.2 Why the result is not accuracy
If keeping altimeter mode long time at same place and the weather changes, the altitude will be not accuracy.
During climbing, if the weather changes high frequency, the altitude will be not accuracy.
At this time, please calibrate sea level altitude or sea level air pressure on time.

7.2 Sea level altitude & sea level air pressure setting
1) Under time mode, long press [M] to enter setting mode
2) Press [A] in turn to alti-baro
3) Press [C] to enter alti-baro
4) Press [B] to switch between sea level altitude and sea level air pressure.
5) Press [C] to enter into setting mode
6) Press [A] or [B] to set data
7) Press [M] to return to last menu
8) Press [L] to save and exit setting

7.3 Weather forecast
Under time mode, weather forecast will display on top of LCD.
Weather forecast have four style: sunny - partly cloudy - cloudy - raining. The accuracy of weather forecast is 70%.
When climbing or under altimeter mode, the accuracy of weather forecast will be influenced. If it is not accuracy enough, please calibrate it base on item 5.4.

7.4 Altimeter
Under time mode, press [A] to enter altimeter mode.
LCD display,
- Upper: Sports time
- Middle: Sea level altitude
- Below: Press [B] to switch among climbing altitude, temperature, climb rate, climbing time.
PS: During measuring temperature, please take off on wrist as body temperature will influence the accuracy.

Climbing altitude
Under time mode, press [A] to enter altimeter mode. At below of LCD display, it is climbing altitude.
When start climbing, long press [B] to clear climbing altitude to zero. Then press [B] to switch to climbing time (LOG 00:00:00), press [A] to start to record climbing time.
Under climbing time record mode, press [A] can start or stop record.
Long press [B] to reset climbing altitude and time seperately.

Altitude record
Unit will record altitude every half hour and display as an altitude trend chart. Under a ltimeter mode, press [C] to check altitude record. Press [A] or [B] to browse altitude record in turn.
Total altitude gain and total altitude loss Under altimeter mode, press [B] to switch to climbing time
Press [A] to start climbing time record, unit will count altitude gain and altitude loss automatically.
Press [A] to stop climbing time record. Unit will count total altitude gain and loss automatically.
Long press [C] to clear zero of total altitude gain and loss.
Under altimeter mode, press [C] two times to check total altitude gain and loss.

Calculation of total altitude gain and loss,
From A to B, propradation,
The total height gain=d1+d2+d3;
From B to C retrogradation,
The total height loss=d4+d5+d6

7.5 Barometer
Under time mode, press [B] to barometer mode.
LCD display,
- Upper: Sea level air pressure
- Middle: 24 hours air pressure trend chart
- Below: Press [B] to switch among current air pressure, time and temperature.

Air pressure record
Unit will record air pressure every half hour and display as an air pressure trend chart.
Under barometer mode, press [C] to check air pressure record. Press [A] or [B] to browse air pressure record in turn.