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) enhances standard GPS accuracy using reference stations with known locations.
These reference stations frequently utilize National Geodetic Survey (NGS) markers for precise, fixed coordinates.
DGPS corrects signal errors by comparing these marker positions with GPS satellite signals.
Consumer-grade GPS devices for recreation or mapping do not directly employ geodetic markers for error correction.
Consequently, DGPS is the appropriate answer.