What does the term "D-GPS" refer to in navigational technology?

The term "D-GPS" refers to Differential GPS technology. This is a method used to enhance the accuracy of GPS measurements. While standard GPS can provide location information within a range of approximately 10 to 20 meters, D-GPS significantly improves this accuracy to within one meter or less.

Differential GPS works by using a network of fixed ground-based reference stations that broadcast their GPS signals to users in real-time. These stations calculate the difference between their known fixed positions and the positions reported by GPS satellites. By sending this correction information out, D-GPS allows receivers to adjust their calculations, compensating for errors in the satellite signals caused by atmospheric conditions, satellite orbit errors, or clock differences.

This enhanced accuracy is particularly useful in maritime navigation, where precise positioning can be crucial for safety and navigation efficiency. Understanding D-GPS technology is important for navigators who rely on clear and precise location data for successful marine operations.