Calibration of barometric pressure settings
Calibration of barometric pressure requires some additional understanding, which we will provide here. Also provided is a step by step procedure for calibrating correctly. Absolute barometric pressure, can be calibrated at manufacturing time by comparing with a precise instrument that measures pressure at the same location. In practice, sometimes small adjustments of a few hPa may be needed. The relative pressure represents what the air pressure would indicate if your station was at sea level and depends on the altitude of your console and cannot be known in advance. This is why it needs an adjustment. There are different manners in which to handle this adjustment. We will outline a reliable procedure below, which requires adjusting both pressures. The method assumes that you have an official airport sufficiently nearby to act as a reliable reference. Usually distances of up to 25 miles work reliably, but this is not always true and depends on geography. We start by assuming ...
