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Here are some USGS Web pages with more information on map coordinate systems and Anywhere:

Geography Frequently Asked Questions (Score: 3.000)

Maps Frequently Asked Questions (Score: 3.000)

Datum shifts and digital map coordinate displays Explanation for users in GIS environments and those using Universal Transverse Mercator (UTM) grids of the unexpected differences in distances and coordinate readouts due to shifts in the 1927 and 1983 North American Datums. (Score: 1.000)

FAQs concerning horizontal datums and ellipsoids (Score: 1.000)

Map Projection Publications Fact Sheet 087-99 (Score: 1.000)

USGS information products about mapping and related subjects Links to USGS publications on cartography and mapping. The information products are available in printed and digital formats. (Score: 0.690)

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About map coordinate systems:

Definition: Numeric methods of representing locations on the earth’s surface on maps. [Adapted from Mathematics of Cartography: Mathematics Topics-Coordinate System, link]

Used for: coordinate systems, geographic coordinate systems, grid coordinate systems, horizontal datums, map projections, vertical datums