I'm working on flight sensors for a project and I'm supposed to model GPS device noise. I looked a lot for it online and could not get a convincing answer.
I need the uncertainties of altitude and Lat/Long measurements from an aviation grade GPS device such as a GARMIN GTN 750. By uncertainty I mean + or - certain metres for altitude and + or - certain degrees for Lat/Long.
I found just one web page mentioning the vertical uncertainty as 10m but again there was no reference attached to it and nothing for Lat/Long.