GPS geofencing for every job site.
WorkTrac is a workforce management app with built-in GPS geofencing for field crews. Office staff draw geofence boundaries on a map around each job site — radial or polygon — and the mobile app auto-prompts crew members to clock in when they enter the geofence and to clock out when they leave. GPS coordinates are captured on every punch with a timestamp and stored as part of the cryptographic work proof record, giving contractors a defensible audit trail for prevailing-wage compliance, billing disputes, payroll questions, and DOL investigations. Geofencing can be enforced as a hard rule (clock-in only inside the fence) or as advisory (warn but allow). It is included in every paid tier of WorkTrac, including Starter at $29/mo. The same geofence data drives shift dispatch, route optimization, and travel-time reporting without a separate setup step.
How geofencing works in WorkTrac
A foreman or office admin opens the dashboard, picks the site, and either drops a pin with a configurable radius or draws a polygon directly on the map. The fence saves immediately and propagates to every crew member assigned to that site on their next mobile sync. There is no separate GPS provider to enable, no per-device opt-in, and no extra cost — geofencing is built into the same OkHttp + Room offline-first stack the rest of the app uses.
On the mobile side, the app reads the device GPS in low-power mode whenever a task is active or a shift is scheduled. When the device crosses a geofence boundary, it raises a system event that surfaces in the app as a clock-in prompt with the matched site's name pre-filled. The crew member taps once to confirm. Crossing the boundary the other way produces an analogous clock-out prompt, again with one-tap confirmation.
Office staff control whether the fence is advisory or enforced per site. Advisory mode warns the crew member but still accepts the punch (useful for sites with poor GPS coverage). Enforced mode rejects the punch outside the fence and prompts the worker to move on-site or contact dispatch.
What gets captured on every clock-in
WorkTrac stamps every clock-in and clock-out with latitude, longitude, GPS accuracy radius, device timestamp, server-received timestamp, and a fingerprint of the geofence that matched. The accuracy radius is critical — it lets the dashboard distinguish a 5-meter GPS lock on a sunny rooftop from a 200-meter lock inside a basement, so disputes can be resolved on real numbers rather than gut feel. The whole capture is included in the cryptographic work proof chain, which means even an admin can't silently edit a clock-in record after the fact.
Decimal degrees, full precision. Plotted in the dashboard map.
Meters of expected error. Surfaces in disputes — a 5m punch and a 200m punch are not equivalent evidence.
Both captured. Clock-drift detectable; offline-queued punches retain device time as the source of truth.
Which fence the punch satisfied. Multiple overlapping fences resolve by smallest area.
Signed at capture. Server validates; tampering breaks the chain.
Required-photo tasks can enforce a clock-in photo with the same GPS stamp.
Defensible records for prevailing wage and disputes
Contractors working public-works projects under Davis-Bacon, state prevailing wage statutes, or any DOT-funded program have to produce certified payroll showing the hours each worker spent on-site. A buddy-punched timecard or a hand-written sheet does not hold up under audit. The combination of geofenced clock-in plus GPS on every punch plus a cryptographic work proof chain produces records that survive scrutiny: every claimed hour is tied to a verified location, captured by the worker's own device, and signed in a way that detects after-the-fact edits.
The same records resolve disputes downstream. A client questions an invoice — pull the GPS heatmap for the disputed week. A worker disputes their paycheck — the same heatmap shows the actual punches. An insurer questions a workers' comp claim — the incident report carries the location it was filed from. Geofencing converts every common field-services argument from "your word against theirs" to "here is the record."
Where geofencing pays off
Construction GCs use it to verify subs are on the right site before billing. HVAC and plumbing shops use it to enforce that service techs are at the customer address before starting the clock — eliminating the round-trip-time padding that erodes margins on flat-rate work. Electrical contractors on multi-site service jobs use it to bill the right job for each segment of the day. Landscaping crews working scheduled routes use it to auto-route travel time vs work time without manual entry. And on prevailing-wage public-works projects, the chain doubles as the contractor's defense file the moment a certified-payroll request lands.
Common questions, answered.
Accuracy depends on the device, sky view, and proximity to buildings — typical phones lock to 3–10 meters outdoors with clear sky and 20–50 meters in dense urban or partially-covered sites. WorkTrac records the accuracy radius on every punch so disputes can be resolved on the real number. For sites with chronically poor GPS, the geofence can be set to advisory mode so a poor lock does not block legitimate punches.
Also explore
Every clock-in and GPS punch works in dead zones. Queues locally and syncs on reconnect with no duplicates.
Every GPS punch is signed at capture time. The chain detects after-the-fact edits.
OSHA incident reports inherit the same GPS + timestamp stamping for inspector-ready records.
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