Question

Which GPS uses National Geodetic Survey markers?

• A. GPS
• B. DGPS
• C. Recreational GPS
• D. Mapping GPS

Hint:

DGPS uses known survey points to enhance GPS accuracy.

Answer 1

The Correct Option is B

DGPS (Differential GPS) improves the accuracy of standard GPS by using reference stations at known locations.
These reference stations often rely on National Geodetic Survey (NGS) markers to provide precise, fixed coordinates.
By comparing the known position of these markers with GPS satellite signals, DGPS corrects signal errors.
Recreational or mapping GPS devices do not directly use geodetic markers for corrections.
Therefore, DGPS is the correct answer.