Read the accuracy badge first
A reading such as GPS +/-4 m is the accuracy reported by the phone. It is not a promise that every point is within four meters of the true location, and it is not the precision of the sprayer's application.
Buildings, trees and other obstructions can affect GPS reception. Device hardware and the surrounding environment also matter. GPS.gov explains the factors behind GPS accuracy.
AgriPath's current recording filter excludes fixes with missing accuracy or reported accuracy worse than 15 meters. That cutoff helps reject poor points; it does not make accepted points survey-grade. A narrow boom can be smaller than the uncertainty in the phone's position.
What the green coverage means
As usable points arrive, AgriPath draws coverage polygons between locations using the job's fixed boom width. It does not measure nozzle output or sense whether chemicals are flowing. Start and pause recording to match the work you want included.
Repeated recorded passes create darker areas where the translucent polygons overlap. GPS drift and an incorrect boom width can also affect the shape and apparent overlap. The map is useful for reviewing a recorded route, but it cannot verify the exact treated edge or prove that an area received a particular dose.
Why a route may contain gaps
Coverage is intentionally not drawn across every pair of received locations. The app rejects poor fixes and implausible jumps, skips very small movements, and does not join locations more than 30 seconds apart. After a pause or interruption, it starts a new segment instead of filling in the missing journey.
If the GPS badge shows a weak or lost signal, check the phone's Location setting and move to a clearer view of the sky. Previously saved points remain, but reopening the app cannot recover locations it never received.
In the updated beta, the vehicle marker follows GPS direction of travel. It becomes a dot when direction is unavailable or you are stopped. It does not show which way you are holding the phone.
A practical check before a working session
- Confirm your equipment profile and actual boom width before starting the job.
- With no chemical application, record a short route in an open area and compare the displayed coverage with the route you followed.
- Include a pause, some travel while paused, and a resume. Check that the paused trip did not become a coverage stripe.
- Repeat with the screen locked for part of the route. Use the offline recording checklist to test the conditions you expect.
AgriPath records coverage and session details. It does not provide precision steering, control the sprayer, or switch sections automatically. Once the record is saved, you can export its coverage and notes for review.