We used here is UTM33 projection, projective planes is zero scaling coefficient is 0.9996, to the scaling coefficient approximate to 1, so set your plane elevation of 2800 meters.Coordinate with 15 degrees in the southern hemisphere, UTM33 coordinate system.If the plane is zero, in GPS hand thin WGS84 coordinate system and two sets of GPS coordinates input hand thin UTM33 coordinate system automatically convert seven parameters in this I understand.But after adjust plane of elevation, the parameters in the coordinate system in GPS I wouldn't set, please friends of three mountains mountains give advice, thanks a lot!Welcome to speak out, I've never used the GPS, is still in exploring...
