Dipper: GPS Area Measure

Measure land area, distance, and perimeter on iPhone and iPad — tap the corners on satellite imagery, walk the boundary with GPS, or connect an RTK GNSS receiver for centimeter-level accuracy.

Built for farmers, landscapers, roofers, fence and paving contractors, real estate agents, surveyors and their field crews, and anyone who needs a number for a piece of ground they can trust.

CENTIMETER ACCURACY WITH AN RTK RECEIVER
Phone GPS is good to a few meters. When that is not enough, connect an external GNSS receiver and measure with RTK corrections:
• Connects over Bluetooth LE or Wi-Fi (TCP) to receivers that output standard NMEA (GGA, RMC, GSA, GSV, GST and more)
• Built-in NTRIP client: add your RTK network, CORS, or base station account, and the app picks the nearest base station for you
• Fix status in plain words, from meter-level to centimeter-level (RTK fixed), with the receiver's accuracy estimate on every point
• Technical details: sky plot, satellites in use, signal strength, PDOP, and the receiver's error estimates
• Each measurement keeps to one correction source, so points from different services are never mixed
• Heights are recorded with every point and kept in DXF exports
Accuracy depends on your receiver, your correction service, and how much open sky you have.

FIVE WAYS TO MEASURE
• Map tap — tap each corner on satellite imagery. Fastest when you can see the boundary.
• Crosshair — pan the map under a fixed reticle and drop points exactly where you want them.
• GPS walk — walk the boundary while smart filtering keeps only usable fixes.
• GPS corner — stand at each corner and capture a point. The most accurate way, especially with an RTK receiver.
• Route — walk, ride, or drive while the app records the distance you travel.

KNOW YOUR MARGIN OF ERROR
Most measuring apps give you a number and no idea how much to trust it. This one shows the accuracy behind every measurement, filters out bad fixes and unrealistic jumps, and tells you plainly when conditions are poor. Three quality thresholds let you decide how strict to be.

SHAPES AND CORRECTIONS
• Areas, distances, and circles from a center and radius point
• Rectangles and corridors from their construction parameters
• Subtract ponds, buildings, and any other region you need excluded from the net area
• Add multiple counted areas and get the combined total
• Drag, insert, and delete vertices with full undo and redo
• Warnings for duplicate points, collinear points, and self-intersecting outlines

PROFESSIONAL REPORTS
Generate a PDF report with a map of the measurement, all values, per-segment distances and bearings, the accuracy basis, the address, and your field photos with captions. Photos taken in the app are stamped with position and direction — from the receiver when one is connected — so each one is placed on the map and shows which way it faces.

EXPORT
• Export PDF, DXF, KML, GeoJSON, and GPX — opens in CAD software, QGIS, ArcGIS, Google Earth, and most GIS tools
• Copy the coordinate list as text

ORGANIZE YOUR WORK
Group measurements into collections, tag and favorite them, search across names, notes, and addresses, and filter by type. Deleted measurements go to Recently Deleted and stay recoverable for 30 days.

APPLE MAPS OR GOOGLE MAPS
Switch basemaps at any time, in standard, satellite, or hybrid style, with place search and current location.

PRIVATE BY DESIGN
No account. No sign-up. No ads. No tracking. Your measurements, photos, and notes stay on your device — nothing is uploaded, and exports happen only when you choose to share. Your NTRIP login goes only to the correction service you enter.

BUILT FOR IPAD
The same tools on the big screen, in portrait or landscape.

ACCURACY AND RESPONSIBLE USE
The app measures with GPS, GNSS receivers, and map imagery. Even with RTK, it is a measuring and estimating tool, not a legal survey. Do not use it to establish property lines, settle boundary disputes, or replace a licensed surveyor.