RTK farming accuracy: what matters in the field

What does centimetre-level accuracy mean?

RTK farming accuracy describes positioning performance under stated conditions, not a guarantee of the final implement path. A good correction signal is important, but the receiver, installation and machine setup also contribute to the result.

Ordnance Survey’s GNSS guidance describes centimetre-level positioning with suitable corrections, hardware and environmental conditions. Treat that as background to the technology, not a performance certificate for every tractor, field or RTK package.

Pass-to-pass, repeatability and absolute accuracy

These are different questions. Good consistency today does not, by itself, demonstrate that saved work will line up next season. Oklahoma State University explains these agricultural GPS accuracy terms.

Effectively indefinite repeatability

Our farm-base setup is designed for effectively indefinite repeatability. Its maintained reference accounts for the tectonic plate movement shared by the base and surrounding fields, so there is no inherent five-year expiry for returning to saved guidance.

A consistent land-fixed reference is the key. Ordnance Survey explains how Europe’s plate-fixed reference frame accounts for continental motion. This principle is about keeping positions consistent with the land over time; it does not remove other sources of positioning or steering error.

The antenna must remain stable, and reference coordinates, datum settings, receiver configuration, saved guidance and machine calibration must be maintained consistently. Moving a base, changing coordinates or switching correction references needs a planned check. For Base-Free RTK, the supplied network reference must also be checked. Effectively indefinite repeatability describes the reference setup, not an unconditional lifetime accuracy or service guarantee.

Why RTK FIX matters

A fixed RTK solution resolves the satellite carrier measurements needed for high-precision positioning. A float solution has not resolved those measurements in the same way and should not be treated as equivalent. Your display may also show a different correction mode while recovering a connection.

Use the receiver’s solution status and correction age when investigating an issue, rather than relying only on the position shown on the map. ESA’s RTK fundamentals explains the distinction between fixed and float solutions.

What changes the result in the field?

• Satellite visibility: trees, buildings and other obstructions can interrupt measurements.
• Reflected signals and interference: the antenna’s surroundings matter as well as the number of satellites shown.
• Reference position and distance: the base coordinates and the relationship between base and machine affect the solution.
• Correction delivery: an internet-based NTRIP system needs usable mobile data and current correction messages.
• Machine and implement setup: antenna offsets, steering calibration, working width and implement movement affect where the work lands.

Trimble’s receiver guidance describes the effects of base coordinates, signal environment and operating range. Installation and setup deserve the same attention as the headline accuracy specification.

Protect saved lines when changing services

Before changing a base, receiver or correction provider, keep a copy of the existing configuration and guidance data. Record which correction source and reference position the machinery currently uses. Tell the new provider that keeping existing lines aligned is part of the requirement.

For an RTK Solutions setup check, send the relevant receiver and display details and explain which boundaries, tramlines or rows must be preserved. We can review the configuration before the change. Avoid altering base coordinates or applying a field shift simply to hide an unexplained discrepancy.

Where a change is required, agree how it will be checked in the field. Preserving the right reference and settings is more useful than repeatedly correcting each individual guidance line after the event.

A practical field-check record

Use a suitable field location and the machine manufacturer’s guidance for any calibration work. Make a short record that lets you compare the same setup before and after a change:

1. Save the configuration. Record the receiver, correction source, machine profile and implement settings.
2. Record the positioning status. Note RTK FIX or the current mode, correction age and whether the data connection remains available.
3. Compare the intended work. Check the saved line, actual implement position and relevant offsets, rather than judging only the screen marker.
4. Check consistency over time. Return to the same agreed reference after an interval and record any difference, keeping the configuration unchanged.
5. Send useful evidence. Field location, time, photographs and display screenshots help distinguish a correction problem from a setup issue.

This is a suggested record for discussing your setup with support, not a laboratory accuracy test or a substitute for manufacturer calibration procedures.

The tractor has RTK FIX but the work is off-line

If the receiver stays fixed while the implement follows the wrong path, investigate the complete guidance setup. Check which machine and implement profiles are loaded and compare the configured offsets with the actual equipment. Ask your machinery specialist about steering calibration, terrain compensation and implement behaviour.

If the problem instead appears with correction dropouts, record whether it follows a particular field location, mobile-data interruption or loss of satellite visibility. Our RTK troubleshooting guide helps organise those checks, while the NTRIP guide explains the connection details.

Questions to ask before buying RTK

• Which accuracy measure is being quoted, and under what conditions?
• Will the correction format work with my receiver and existing unlocks?
• How will my fields, mobile data and installation be checked?
• What happens to my existing guidance lines when the service changes?
• Who supports the correction connection, receiver setup and steering equipment?

Our RTK farming overview explains the available approaches. The package comparison covers the farm-owned base and Base-Free options, with clear prices and compatibility checks.