Compass with ruler

1 altimeterAbsolute height measurements. Altimeter used to be before or after the initial purchase, then, about a high degree of dollars to adjust for local conditions elevations. At this point Note: Please refer to map the location of the value of the calibration altitude. In addition, pressure changes and changes in weather will continue to affect the high value of the table above sea level, so it is necessary to the process of climbing or walking a high degree of constant comparison reference value; relative height of the measurements: in the mountain or road in the process, For Measurement of the high environmental value, follow the two steps; (1) altimeter initialized before departure, about the pointer aligned 0 scale (2) or the end of the road during the height of the value measured at the height of the location shall be value.2 GaugeForecast Weather trend usually sharp rise in air pressure that will be good progress on the weather, the opposite may be the future short-term weather changing or showers. Specific fact sheets on specific numerical reference3 high - pressureWith the high pressure and decreased gradually increasing. According to this principle the value of a location and a high degree of pressure on the value of relationship:(1) If the pointer adjusted to 0 height, 0 at this time scale corresponding to the air pressure line shall be the location of the actual pressure value(2) If you want to know the location of a high pressure area or a depression, just the measured pressure value and the standard pressure value (1010.25HPA) can be compared.(3) If the 0 scale adjusted to the location of the corresponding pressure value (which can be found at the airport or weather station, etc.), then the time shall be the pointer value corresponds to the height of the location of the actual height value.