Will corrections reach you over cell data?

With NTRIP, your rover (or its controller or phone) logs in to the provider's server over the internet and streams corrections the whole time you work. If data drops for more than a few seconds, the rover falls back from FIX to FLOAT. The provider pages on this site list whether each service needs cell data at the rover.

Corrections don't need fast internet, but they need a steady connection. One bar that never drops beats full bars that come and go.

• Second carrier. A hotspot or SIM from another carrier often covers the gap.
• Your own base plus radio. Set a base nearby and send corrections by UHF or LoRa radio. No internet needed.
• PPK. Record raw data on site and correct it later at the office, using a base or NOAA CORS files. See the baseline distance check for your nearest CORS.
• Satellite corrections. A few services send corrections by satellite instead of cell. Look for them on the compare page.

Carrier maps are predictions, and carriers draw them generously. The FCC National Broadband Map shows what carriers report to the FCC under its rules, and you can file a challenge there if it's wrong. Neither one replaces a test at the spot. Hills, valleys, metal buildings and the inside of a truck all cut signal.