The altimeter instrument of Air Navigation displays altitudes above Mean sea level (MSL) as reported from the GPS unit. Usually the altitude has an accuracy of 70 ft or less. The accuracy is usually even better with external GPS modules.
The altimeter instrument of Air Navigation displays altitudes above Mean sea level (MSL) as reported from the GPS unit. Usually the altitude has an accuracy of 70 ft or less. The accuracy is usually even better with external GPS modules.