Troubleshooting RTK Float Issues: 7 Common Causes & How to Fix Them

Have you ever set up your RTK GNSS system and everything looks fine — but your rover stays in FLOAT mode instead of FIX? You’re not alone. RTK float issues are one of the most common problems surveyors and drone pilots face, especially when using NTRIP or third-party equipment.

In this article, we’ll cover the 7 most common causes of RTK float status and how to fix each one step by step.

📌 What Is RTK Float?

FLOAT means your GNSS receiver is receiving correction data, but it hasn’t locked onto a stable position yet. This results in position accuracy between 20 cm and 1 meter — far less than the usual 1–2 cm you expect from a true RTK FIX.

RTK float can be caused by signal issues, software settings, or hardware mismatches. Here’s how to diagnose it.

⚠️ 7 Common Causes of RTK Float Mode

1. Poor Satellite Geometry (High DOP)

When satellites are clustered too closely in the sky, your DOP (Dilution of Precision) value increases, making it harder to resolve a FIX.

Solution: Wait for more satellites or check a GPS planning app for better satellite windows.

2. Antenna Not Fully Initialized

If your receiver has just been turned on or moved, it may still be collecting enough phase data to calculate a fix.

Solution: Stay still for 2–5 minutes and ensure a clear sky view while initialization completes.

3. Correction Format Mismatch

Your rover might receive corrections in a format it doesn’t support, such as RTCM 3.2 MSM4 on a receiver that only supports RTCM 3.0.

Solution: Match the correction output format from the base/NTRIP caster to what your receiver supports.

4. Obstructions or Multipath

Nearby buildings, trees, or even vehicles can cause signal reflections, leading to float status.

Solution: Move to a more open area with fewer vertical obstructions.

5. Weak Internet or Radio Signal

If using NTRIP, poor mobile data can interrupt correction streams. For radio-based RTK, interference or range issues can cause loss of fix.

Solution: Improve signal quality or switch to a more stable mountpoint/caster.

6. Incorrect Antenna Height or Type

If the antenna model or height is misconfigured, it may throw off calculations and prevent fix from resolving.

Solution: Double-check your antenna settings, height, and calibration in your GNSS app.

7. Outdated Firmware or App

Sometimes float issues are caused by software bugs that have been fixed in newer firmware or GNSS apps.

Solution: Update your GNSS receiver firmware and use the latest version of your control software (e.g. Field Genius, SW Maps, SurvX).

🧪 Bonus: Quick Float Troubleshooting Checklist

✔️ RTK correction source is active (NTRIP/base/radio)
✔️ Receiving at least 15+ satellites
✔️ Fix indicator is set to “FIXED,” not just “RTK” or “FLOAT”
✔️ Antenna placed on stable tripod with clear sky view
✔️ Data link is stable (mobile internet or UHF)

📞 Still Getting Float? Let’s Help You Out

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Coming soon: RTK vs PPK vs Static GNSS – Which One is Right for Your Project?