We need to offer different standard formats of corrections to serve a wide range of rovers, new and old. A mountpoint defines the type of processor used, what satellite constellations are supported, the format of the correction messages, and the reference frame used in the real-time data stream.

For instance, CMR+ (GPS+GLN) for some rovers, RTCM3.1 (GPS+GLN) for other rovers, and RTCM3.2 with MSM (GPS+GLN+GAL+BDS+QZSS) for multi-constellation rovers and CMRx (GPS+GLN+GAL+BDS+QZSS) which only works with Trimble multi-constellation rovers. You should not see any significant difference between results from any of the formats, except that some support more satellites and the ones that start with NSB use just a single base and you will need to watch how far you get from the base as ppm errors increase as you do. See our User Guide or our NTRIP and Mountpoints page for more details on mountpoint names.