What are the fields in the DIFFERENTIAL SETUP dialog box for?
A description of the Fields follows: • Alt. Control: Set this to “No altitude control” most of the time. The other options apply only when you are getting poor reception. The other options give you an opportunity to correct 2D points by supplying the altitude. Altitude Always Fixed: If you know the altitude of the job (assuming all points in the job are at about the same altitude) you choose “altitude always fixed.” All points will then be fixed to the HAE altitude in “Enter Altitude for above (if needed).” Fixed When # of Sats = 3, GDOP >5: This option works the same as “Altitude Always Fixed”, except it applies the fixed altitude only to those positions where there is data from only 3 satellites or where the GDOP is greater than 5. * Example: You collect points on the streets of a city. You get poor reception (because of the buildings, for example.) Most of your points are 2D, so they can not be differentially corrected by normal means. However, you know that the elevation was about
