RTCM3 specification

RTCM3 is an industry standard format for base correction output.

Messages for Reach rovers

RTCM3 message	Message type	Description
1006	ARP station coordinate	Provides the earth-centered, earth-fixed (ECEF) coordinates of the antenna reference point (ARP) for a stationary reference station and the height of the ARP above a survey monument. It is the mandatory message to turn on.
1074	GPS MSM4	Provides pseudorange, phase-range, and SNR for the GPS system. It is recommended to keep enabled at least the GPS 1074 message.
1084	GLONASS MSM4	Provides pseudorange, phase-range, and SNR for the GLONASS system.
1094	Galileo MSM4	Provides pseudorange, phase-range, and SNR for the Galileo system.
1124	BeiDou MSM4	Provides pseudorange, phase-range, and SNR for the BeiDou system.
1230	GLONASS code-phase biases	Provides pseudorange, phase-range, and SNR for the GLONASS system.

When using another Reach as a base for another Reach used as a rover, we recommend picking the following messages:

RTCM3 message	Message type	Description
1004	GPS	A legacy message that provides extended L1&L2 GPS RTK observables.
1008	Antenna Descriptor and Serial Number	Provides textual description of the antenna “descriptor” which is used as a model number, and an antenna serial number in text format. Also has station ID (a number). The descriptor can be used to look up model specific details of that antenna.
1012	GLONASS	A legacy message that provides extended L1&L2 GLONASS RTK.
1033	Receiver and antenna descriptors	Provides short textual strings about the GNSS device and the antenna.

When using Reach as a base for legacy third-party receivers, we recommend picking the following messages: