What is the nominal accuracy of a modern Differential GPS (DGPS) system?

The nominal accuracy of a modern Differential GPS (DGPS) system is indeed less than 10 meters. DGPS enhances the accuracy of standard GPS signals by using a network of ground-based reference stations that broadcast corrections to the GPS signals received by DGPS-enabled receivers. This correction process greatly reduces the sources of error that typically affect GPS accuracy, such as satellite clock errors, atmospheric conditions, and multipath effects.

Because of these enhancements, DGPS can achieve accuracy within a range of about 1 to 10 meters. This level of precision is critical for applications requiring detailed positioning, such as navigation in coastal waters, offshore construction, and other maritime activities where positional accuracy is essential for safety and operational efficiency.

In contrast, other options would reflect less favorable accuracy standards that do not align with the capabilities of modern DGPS technology, making them less accurate in terms of real-world applications.