Final answer:
True. Differential correction for GPS requires a base station with known coordinate points.
Step-by-step explanation:
True. Differential correction for GPS requires a base station with known coordinate points. Differential correction techniques are used to enhance the quality of location data gathered using global positioning system (GPS) receivers. Differential correction can be applied in real-time directly in the field or when postprocessing data in the office.
DGPS (Differential GPS) is essentially a system to provide positional corrections to GPS signals. DGPS uses a fixed, known position to adjust real-time GPS signals to eliminate pseudorange errors. An important point to note is that DGPS corrections improve the accuracy of position data only.
Age of corrections, or Age of differential (AOD) is a measure of how old the corrections sent to the receiver are. It is calculated by subtracting the time when the correction message has been generated from the current receiver time.