Hi,
I am working with a 62s and have been fiddling around with the altimeter.
My issue is that I can't calibrate the altimeter Correctly if I use the sea-level reported Barometric pressure of the towns surroundign me (even an average of the lot, two within 10 miles and 2 within 50 miles).
My known elevation is 145m.
If I calibrate using "known elevation", I will always get a lower barometric pressure (corrected to sea level) than the reported measurements in the town (also corrected to sea level).
For instance, calibrated to 145m this AM, 62s said barometric pressure is 1021.1 hPa. Check of the baro pressure in twon shows 1023.0, next town across is 1022.6 ((I am between the two towns).
So If I were to claribrate using known barometric pressure, from the weather service, then my elevation reading on the 62s will be something like 160m +.
I have found this on a few occasions now.
In my mind this raises questions as to the accuracy of the lapse rate used in the atmospheric model by the 62s. if over a real 150m rise an extra 10m could be added by the unit, how much of a difference would this model make if I were to go up the dividing range (1000m+)?
As far as I am aware the auto calibrate adjusts for barometric pressure changes only.