The North American Datum 1983 (NAD83) is a geocentric datum that was established in 1986 for the United States, Canada, Mexico, Central America and the Caribbean Islands. Hawaii and Greenland were also connected to this datum.What is the difference between NAD 27 and NAD 83?
In surveying, cartography, and land-use planning, two North American Datums are in use for making lateral or "horizontal" measurements: the North American Datum of 1927 (NAD 27) and the North American Datum of 1983 (NAD 83). Both are geodetic reference systems based on slightly different assumptions and measurements.How do I convert the 1963 datum to NAD83?
The following datum shift converts coordinates referenced to the Guam 1963 datum to NAD83. Perform the conversion as follows: lat, long (NAD83) = lat + 5.15932", long + 8.71596" NOTE for the above methods: The FCC previously provided these datum shift coordinates rounded to two decimal places. ULS will record latitude and longitude to the tenths.When do I need to convert licensing data to NAD83 coordinates?
If the source from which you obtain the coordinates is referenced to another datum (e.g., NAD27, PRD40) you must convert the coordinates to NAD83. The FCC uses the procedures outlined below when converting licensing data to NAD83 coordinates when a radio service is converted to the Universal Licensing System (ULS).