MIT ICAT GPS XYZT The Global Positioning System Measurements of code-phase arrival times from at least four satellites are used to estimate four quantities: position in three dimensions(X,Y, Z)and GPS time T) P: H Dana: 5/10.98 (Courtesy of Peter Dana. Used with permission. Fromhttp://www.colorado.Edulgeographylgcraft/notesgpslgpsf.htmlMIT ICAT GPS From http://www.colorado.Edu/geography/gcraft/notes/gps/gps_f.html (Courtesy of Peter Dana. Used with permission.)