That's a hell of a lot of money. I'm guessing thats military grade equipment.No matter what the unit says no hand held gps will archive 2m accuracy, to clarify I'm a land surveyor and use high accuracy gps every day, if you want better than 7m then you need to pay $8k for unit that will get you 500mm, if you need better than that you have to pay $45k to get 20mm
You are also then comparing against the geographic accuracy of aerial photos...which is not good and varies hugely depending on where in the world you are
You have nothing to worry about
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Does anyone know how the auto calibration altimeter function works on the Garmin Fenix? For instance, if I set the altimeter to continuous calibration, barometric plot to variable, mode to always on and interval to most often, I realise it uses the barometric altimeter to guage height, and auto calibrates it using GPS. But what is it auto calibrating exactly, height or sea level pressure? And how often is it auto calibrating? Does it use the normal 'most often' function it uses to track horizontal position, or does it auto calibrate, say, every minute, a fixed intervaI that cannot be changed? The reason I ask is because if it auto calibrates every second, then its essentially not using the barometric alterimeter, as its not giving it a chance to function. Or does it use a median of the barometric and gps readings?