How Accurate Is Phone GPS for Farming?

So, how accurate is a phone in a field?

There isn't one number that applies to every phone and every day. GPS.gov gives an open-sky smartphone example of roughly 16 feet (4.9 meters) radius, while noting that trees and structures can make reception worse. That figure is only an example. It doesn't mean your tractor's marker will stay within 16 feet. You might even see it wander while the tractor is parked.

Where you test matters

Satellite visibility, terrain, nearby tree lines, and the receiver inside your device can all affect the result. A phone deep inside a cab may have a different view of the sky than an antenna mounted above it. Test where you actually plan to work, first while stopped and then on a short pass. Compare the screen with what happens on the ground.

Match the tool to the task

A location reference that's useful for finding your way around a field may still be too loose for planting rows or repeating tracks. Don't assume a phone alone offers RTK accuracy. If your job needs tight, repeatable placement, look into compatible external hardware and corrections, and verify the whole setup in your conditions before relying on it.