How do I simulate a geofence?

Open this page and use the live Rhumb Line tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.

Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.

Can I use my own numbers?

Absolutely — every input is adjustable, and with data import you can drive a geofence from your own measurements.

Use case · powered by Rhumb Line

Rhumb Line for a geofence

Simulate a geofence live in your browser. This runs the real Rhumb Line solver — adjust the inputs, watch it respond instantly, and export the result. No install, no account.

For:Students Researchers Educators Engineers Hobbyists & Makers K-12 Students First Responders

Rhumb Line vs Great CircleLive

two ways to cross an ocean

Controls

Presets

Start latitude

End latitude

End longitude

A rhumb line holds a constant compass bearing — easy to steer, and a straight line on a Mercator map, but longer. A great circle is the shortest route but its bearing changes continuously, tracing a curve on the map. Ships and planes crossing oceans follow the great circle, adjusting heading along the way to save fuel and time.

▶ Run in Python

Data Inspector

Great-circle dist9272 km

Rhumb-line dist11022 km

Extra by rhumb1750 km

Governing equation

d_{rhumb} = R \frac{Δ φ}{cos θ} = 11022 km, Δ φ = 1 0^{\circ}, Δ λ = 14 0^{\circ}, θ = const

Reading this result: Steering the constant-bearing rhumb line adds about 1750 km (18.9%) over the great circle — the penalty grows with higher latitudes and a wider longitude gap.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

or unlock everything with Pro →

About this simulation

The full Rhumb Line tool models a geofence with the same numerics engineers and scientists use — running entirely client-side. Change any parameter and the result updates in real time, so you can build intuition, check a design, or teach the concept without spreadsheets or installs.

More you can do with Rhumb Line

Rhumb Line for a GPS route Rhumb Line for a hiking trail Rhumb Line for a delivery zone Rhumb Line for a flight path Rhumb Line for a shipping lane Rhumb Line for a cell-tower map Rhumb Line for a flood zone Rhumb Line for a wildfire perimeter

Other ways to simulate a geofence

Great-Circle Distance for a geofence Map Projection for a geofence GPS Trilateration for a geofence Viewshed for a geofence Spatial Interpolation for a geofence Dead Reckoning for a geofence

Frequently asked questions

How do I simulate a geofence?: Open this page and use the live Rhumb Line tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.
Is it free?: Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.
Can I use my own numbers?: Absolutely — every input is adjustable, and with data import you can drive a geofence from your own measurements.