An advantage over numeric coordinates such as easting and northing, which use two numbers instead of a number and a letter to refer to a grid cell, is that there can be no confusion over which coordinate refers to which direction. As an easy example, one could think about battleship; simply match the number at the top to the number on the bottom, then follow the two lines until they meet in a spot.
Some kinds of geocode also use letters and numbers, typically several of each in order to specify many more locations over much larger regions.
- http://encyclopedia2.thefreedictionary.com/atlas+grid Retrieved 2010-03-22.
- "Archived copy". Archived from the original on 2007-10-10. Retrieved 2010-03-22.CS1 maint: archived copy as title (link) Retrieved 2010-03-22.
- http://www.fide.com/fide/handbook?id=125&view=article Appendices in World Chess Federation Handbook: see part C.7 of section C. Algebraic notation. Retrieved 2010-03-22.