The app shows the receiver's fix level in plain words:
- Meter-level (standalone): no corrections in use.
- Sub-meter (differential): corrections help, but this is not RTK.
- Not yet fixed (RTK float): RTK is still working on a solution. Accuracy is decimeters at best, and the receiver's own estimate may be optimistic.
- Centimeter-level (RTK fixed): the solution has converged.
Under open sky a fix usually comes within a minute or two of corrections arriving. If it doesn't, work through this list.
1. Is the sky open enough?
Open Technical details on the receiver page. The sky plot shows where the satellites are and the bars show their signals. A steady fix usually needs 10 or more satellites in use, with most bars green. Buildings, trees and vehicles block or reflect signals: move a few meters into the open and keep the antenna above your head, ideally on a pole. See Reading the sky plot.
2. Are corrections reaching the receiver?
Under NTRIP on the receiver page, Received from caster and Sent to receiver should keep counting up, and the receiver line should read Using corrections with an age of a few seconds.
- Nothing received: check the account, the mountpoint and the phone's internet connection.
- Received, not used by the receiver: the receiver is not accepting corrections on this connection; enable its RTCM input.
- Corrections are being dropped because the link to the receiver is too slow: bring the phone closer to a Bluetooth receiver.
3. Is the base station close enough?
The Base station line shows how far away the station is. Beyond 20–30 km a fix takes longer and accuracy drops; beyond 40–50 km it often never comes. The app warns when the station is too far for a reliable fix. Use the service's network mountpoint, choose a closer one, or try a service with better coverage where you are.
4. Is it the right kind of mountpoint?
The mountpoint must send satellite observations in RTCM 3 (MSM messages). If it doesn't, the app shows This mountpoint sends no satellite observations; pick another.
5. Give it time
After 5 minutes without a fix while everything above looks normal, the app suggests waiting a little longer or trying another mountpoint or service. Some times and places simply take longer, for example during strong ionospheric activity. Single-band (L1-only) receivers also fix more slowly, and over shorter distances, than multi-band ones.
Still stuck?
Email us at [email protected] with screenshots of the receiver page and Technical details, and the receiver model.