Question 962Navigation General

The correct answer is C) DGPS, within a coverage area. DGPS (Differential GPS) provides the highest level of commercial navigational accuracy by using a network of ground-based reference stations to correct GPS signals and eliminate errors, achieving an accuracy within a specific coverage area typically within a few meters. This makes DGPS the most precise GPS-based navigation system available for commercial applications. The other options are incorrect because: A) SPS (Standard Positioning Service) is the non-military GPS service which has lower accuracy, B) NAVSAT (Navigation Satellite) refers to an older satellite navigation system that uses the Doppler effect, and D) PPS (Precise Positioning Service) is the military-grade GPS service, which has the highest accuracy but is restricted for civilian use.