Help center
How to measure areas and distances, save and share them, and get centimeter accuracy with an external GNSS receiver.
Measuring
Measure an area on the mapMeasure a field, lot or roof in the Area Measure app by placing its corners on satellite imagery, then edit the shape, subtract areas inside it, and save the result.
Measure a distance or routeMeasure the length of a fence line, path or route in the Area Measure app, with the length and bearing of every leg.
Measure with GPSWalk a boundary, mark each corner, or record a route with GPS in the Area Measure app, with tips for an accurate result.
How accurate is it?What accuracy to expect from phone GPS, map placement and an RTK receiver in the Area Measure app, what the ± figure means, and how to get a better result.
Field photosTake or attach site photos in the Area Measure app; each is stamped with its location and direction so it appears on the map and in the PDF report.
Receivers and RTK
What you need for centimeter accuracyCentimeter-level measurements in the Area Measure app need three things together: an RTK GNSS receiver, an NTRIP correction account, and an internet connection on the phone while you measure.
Choosing a GNSS receiverWhat to check before buying a GNSS or RTK receiver to use with the Area Measure app on iPhone, iPad or Android: connection type, NMEA output, corrections and multi-band RTK.
Connect a GNSS receiverConnect an external GNSS or RTK receiver to the Area Measure app over Bluetooth LE or Wi-Fi (TCP), and check that the app is using its position.
Set up RTK corrections (NTRIP)Add an NTRIP correction account in the Area Measure app so an RTK receiver can reach centimeter accuracy, and check that the corrections arrive.
Why isn't RTK fixing?A checklist for when an RTK receiver stays at "Not yet fixed (RTK float)" in the Area Measure app: sky view, corrections, base station distance, mountpoint and time.
Fix levels and accuracyWhat the fix levels and ± accuracy in the Area Measure app mean with an external GNSS receiver, how heights are recorded, and why correction services can disagree.
Reading the sky plotHow to read the sky plot and satellite signal bars in the Area Measure app, and what they say about whether an RTK receiver can hold a fix.
