Glossary

Term	Definition
Base	Also named RTK base, reference station, station: physical GNSS receiver and antenna setup producing corrections (observations) that rovers can use to reach high-precision positioning
Rover	GNSS receiver setup that uses corrections from a base to compute its position with high precision
Caster	Server that receives the corrections from the base and makes them available to rovers via NTRIP protocol
Mountpoint	Also named point de montage in French: unique identifier of a correction
Correction	Also named observation: data produced by the base that allows rovers to compute their position with high precision
RTK	Real-Time Kinematic: technique that uses corrections from a base to compute the position of a rover with high precision in real time
Post-processing	Technique that uses corrections from a base to compute the position of a rover with high precision after the data collection, not in real time.
RINEX	Receiver Independent Exchange Format: standard format for storing GNSS observations, which can be used for post-processing, such as defining the real position of the base
NTRIP	Networked Transport of RTCM via Internet Protocol: protocol used to transmit corrections from the caster to the rovers
RTCM3	Radio Technical Commission for Maritime Services version 3: standard format for corrections, which can be used in real time by rovers to compute their position with high precision
MSM7	Message type in RTCM3 that contains a complete set of observations with highest accuracy, including pseudorange, carrier phase, Doppler, and signal strength for all tracked satellites
MSM4	Message type in RTCM3 that contains a reduced set of observations with lower accuracy, including pseudorange and carrier phase with reduced resolution, and signal strength for all tracked satellites
GGA	NMEA sentence type that contains the position of the rover, which is used by the caster to determine which base is closest to the rover for the NEAR or NEAR4 mountpoints