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actually, think i have it sorted, my local sea level mb is about 1002mb today and it was set as 1013 for reference, but as above is this a function i should turn off?

Hi, I have recently bought a second hand ostc 2n, and have a quick question regards the altimeter function. the previous owner had this turned on but i am unsure as to its function and also it is showing 86m, is this m above sea level? if so can this be recalibrated as its far too high as i am by ...