A geofence is a virtual boundary drawn around a physical location: a construction site, a client building, a security post, an event venue. When a worker tries to check in, their device GPS coordinate is compared against the geofence. Inside the boundary, the check-in is accepted. Outside, it is rejected or flagged for review.
The concept is simple. The execution is where operations succeed or fail.
Why Geofence-Enforced Check-In Matters
Plain GPS attendance records "where the device was when it checked in." Geofence-enforced attendance answers a different question: "was the worker actually on the assigned site, yes or no?" That is the difference between a coordinate in a log and an operational decision.
- Eliminates remote check-ins from home, transit, or the coffee shop down the road
- Removes the supervisor judgment call of whether a check-in "counts"
- Produces audit-defensible records that hold up in client billing reviews
- Forces project linkage at check-in. Workers can only check in to sites they are assigned to
Where Geofencing Breaks in Practice
Three issues show up consistently when teams roll out geofencing for the first time.
1. The Boundary is Drawn Too Tight
A 20-metre geofence on a sprawling construction site rejects workers standing in the parking lot. A 10-metre fence on a multi-floor commercial building rejects anyone on the upper floors, because GPS accuracy drops indoors. Boundaries need to match the operational reality of the site. Not a satellite-photo rectangle.
2. GPS Accuracy Varies by Device, Weather, and Environment
Modern phones are accurate to 5-10 metres outdoors in clear weather. Indoors, in urban canyons, or under heavy cloud cover, accuracy can drop to 50 metres or more. A rigid pass-or-fail geofence creates false rejections at the start of every shift.
3. Workers Learn the Boundary and Game It
If geofence is the only signal, a worker can stand just inside the boundary, check in, and leave. Or hand their phone to a colleague who walks in for them. Geofence alone is not enough.
How to Deploy Geofencing Cleanly
- Size geofences to the operational site, including parking and approach areas. Not a tight box around the building
- Allow a buffer zone where check-ins are accepted but flagged for supervisor review
- Combine geofence with selfie identity capture so a phone handoff cannot defeat the system
- Link every check-in to a specific project, contract, or work order, so location alone is never the only data point
- Surface out-of-bounds attempts in a daily exception report rather than blocking them outright on day one
What Good Geofenced Attendance Looks Like in Production
A morning shift opens. A construction worker arrives at site, opens the app, taps check-in. The device confirms GPS is inside the site geofence, captures a selfie, links the shift to the active project and supervisor, and records the time. The worker is on the clock in under five seconds. Operations has a verified record before the worker reaches their tools.
No kiosk queue. No supervisor judgement call. No reconciliation. The record is verified at the source.
CrewForce360 and Geofencing
CrewForce360 ships geofence-enforced check-in as the default attendance flow, with operator-configurable boundary sizes, buffer zones, selfie verification, and project linkage. Teams can test boundaries site by site, adjust the radius, and go live without turning every first shift into a support ticket.