My question concerns the two barometric pressure readings the the Tempest provides. When I compared my station pressure reading with a local airport my reading for the station was 30.475 and my reading for the other pressure given was 30.573. The airport pressure was 30.44. Is that reading equivalent to my station reading of 30.475 or the other pressure reading of 30.573?
Station pressure is the actual pressure taken at the station, Pressure is the calculated sea level pressure using Station pressure and the elevation & altitude values you entered in the app when it was set up. Unless two stations are at the same elevation and in the same proximity you should not compare Station pressures, only the sea level Pressure values.