Which datum is used by the US Navy for navigation?

The World Geodetic System 1984 (WGS 84) is the datum used by the US Navy for navigation due to its global applicability and integration with GPS technology. WGS 84 provides a consistent framework for determining geographic locations through latitude and longitude coordinates across the world, which is essential for the accurate positioning and navigation that the Navy relies on in various operations.

WGS 84 is particularly advantageous as it incorporates satellite data and provides an ellipsoidal model of the Earth that aligns closely with the Earth's actual shape. This allows for precise coordination and navigation, especially in maritime contexts where accuracy is critical for safety and operational effectiveness. The widespread implementation of GPS systems aligns with WGS 84, making it the preferred standard for navigation among military and civilian entities.

Other datums, such as NAD 83, offer accurate regional mappings but do not have the same global standardization as WGS 84, which is necessary for diverse navigational needs. Similarly, the UTM system is useful for detailed map-making in specific areas but does not provide a global framework like WGS 84. The Geographic Coordinate System is a broader concept that encompasses various datums and projection systems, but it does not define a specific reference frame for navigation purposes.