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Ovel EVV

Geofence distance checker

Type or paste the site's coordinates and a clock-in position, or use your phone's location. See the straight-line distance and whether the position is inside the geofence radius.

Runs in your browser. Nothing is uploaded, no sign-up.

Site or client address

Find coordinates in any map app: press and hold on the building, then copy the numbers.

Clock-in position

Your position is read by your browser only when you press the button, and is never sent anywhere.

Result

Enter valid coordinates: latitude between -90 and 90, longitude between -180 and 180.

How it works

The distance is the great-circle distance between the two points, worked out with the haversine formula:

a = sin²(Δlat / 2) + cos(lat1) x cos(lat2) x sin²(Δlng / 2)
distance = 2 x R x asin(√a), with R = 6,371 km

The position passes when distance ≤ radius. Over the short distances that matter for a time clock, the error from treating the Earth as a sphere is far smaller than the error of a phone's GPS.

Picking a radius

  • Phones typically report positions within 5 to 20 meters outdoors and often 30 to 100 meters or more indoors or between tall buildings. The browser reports its own accuracy estimate with each position.
  • A radius of 100 to 200 meters suits most homes and small sites. Large sites such as construction lots, campuses and warehouses need a larger radius or several points.
  • A position outside the fence should create an exception for the office to review with a reason code, not block the worker from clocking in.

Read GPS and geofence time clocks for field crews.

General information, not advice. Wage, overtime, billing and EVV rules differ by state, payer and year, and the figures here have not been checked for your situation. Confirm them with your state Medicaid agency, your payers, the US Department of Labor or your state labor office, and your own adviser before you rely on them.

Doing this every week?

Ovel EVV works this out from verified visits: GPS clock in and out, signed timesheets, overtime, units and invoices from the same records. Free for up to 5 workers, no card.

Start free Try the live demo

What you type is saved in this browser only (local storage) so it is still here next time. Clear it with the reset button or your browser settings.