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Point it at an NTRIP caster and it answers one question about a GNSS base station: is this station fit to serve RTK, and if not, why?
It does not steer a rover and it does not compute a position. It measures what the station actually delivers — message types and their rates, satellites and their signal strength, the reference position it broadcasts, and how steadily it holds all of that — and states a verdict you can act on, or hand to whoever runs the station.
A run takes about ninety seconds and ends in one of three words:
| STATION OK | Every check passed, and kept passing for a full minute |
| CAUTION | Something is off, or could not be judged. The station may still be usable — read which check and why |
| FAILED | At least one check failed outright |
- Getting started — your first run, in about five minutes
- The eight checks — what each one means, and what to do when it is not green
- The analysis views — sky, signal quality, and the antenna curve
- Troubleshooting — the messages you are most likely to meet
- What the paid edition adds
- Privacy, and how support works
A caster address, a mountpoint name, and credentials if that caster requires them. Many public casters do not: several national networks publish open reference stations, and the app connects to those with the username and password left empty.
You do not need a survey receiver. The measurement is of the station's stream, and the phone's own GNSS is used only to draw satellites in the sky view.