| Datum | Technical Term A Datum is a reference from which measurements are made. You'll find a notation at the bottom of each cache page, "Coordinates are in the WGS84 Datum." This tells you that the coordinates are based on the World Geodetic System's reference frame for the earth, the 1984 revision. The references are due to be revised again in 2010. By the way, Datum's plural form is "Data." Did you know that? |