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7 Troubleshooting
Question #1: Why I’m unable to get RTK Fix when connecting to my local RTK correction service?
Answer #1: RTK correction service has several mountpoint options to select from, mountpoint with
compatible format need to be chosen to work correctly. The mountpoint to choose for S100 are
Virtual Reference Station VRS type, Nearest Station NRT type, or basic RTCM3.x type supporting 1004
/ 1012 sentence, or MSM4 / MSM5 / MSM6 / MSM7 messages, but non-FKP, non-MAC, non-MAX,
non-iMAX, non-SSR, non-CMR, non-CMR+ ones.
Supported MSM4 messages are 1074, 1084, 1094, 1124.
Supported MSM5 messages are 1075, 1085, 1095, 1125.
Supported MSM6 messages are 1076, 1086, 1096, 1126.
Supported MSM7 messages are 1077, 1087, 1097, 1127.
Example 1. Newer MSM4 / MSM5 / MSM7 formats are preferred over older RTCM 3.1 format.
Example 2. VRS (Virtual Reference Station) type is preferred over NRT (closest physical base station)
type, as VRS has no operating range limit. S100 being GPS+GLO+GAL+BDS receiver, RTK base
supporting more satellite constellation (GPS+GLO+GAL) is preferred over one supporting lesser
satellite constellation (GPS+GLO).
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