Vendoor Technologies

GPS time tracking solves the biggest problem with construction timecards: proof. When a worker clocks in, GPS stamps the exact location and time. No buddy punching. No creative rounding. No disputes about who was where and when.

But GPS isn't magic, and on a real jobsite — with concrete walls, remote locations, and workers who don't want their phone battery dying at 2 PM — there are real limitations. Here's what works, what doesn't, and how to pick a system that holds up in the field.

What GPS Time Tracking Actually Does

At its core, GPS time tracking records a worker's location when they punch in and out. The best systems also capture a location trail throughout the shift, so you can verify not just presence but movement across a site or between sites.

For construction specifically, GPS does three things that paper timecards can't:

Eliminates buddy punching. Hard to clock in for your buddy when the system shows you're 15 miles away at a different jobsite.

Verifies jobsite presence. When labor hours are allocated to a specific project, GPS proves the worker was actually at that project's location — which matters enormously for job costing, prevailing wage compliance, and Davis-Bacon documentation.

Creates an audit trail. GPS-stamped time records hold up in disputes, audits, and legal proceedings in ways that handwritten timecards never will.

Where GPS Falls Short on Jobsites

Accuracy Isn't Perfect

Standard smartphone GPS is accurate to about 10–100 meters, depending on signal quality. That's fine for verifying someone is at the right jobsite, but it won't tell you which floor of a high-rise they're on or whether they're inside the building or in the parking lot.

High-precision GPS (using the L5 band on newer phones) narrows accuracy to about 30 centimeters, and survey-grade RTK GPS hits 2 centimeters. But your crew's phones aren't running survey-grade GPS. For time tracking purposes, 10-meter accuracy is usually sufficient — you just need to know they're on site, not their exact coordinates.

The bigger problem is signal interference. Dense urban environments create "canyon effects" where buildings block satellites. Underground work, parking structures, and even concrete-frame buildings can degrade GPS accuracy significantly. Time to acquire a location lock can range from 12 seconds in open air to 12 minutes in poor signal areas.

Battery Drain Is Real

Location services consume battery. In good signal areas, GPS uses about 13% of phone battery over a workday. In weak signal areas — which is most construction sites — that number can hit 38%. A worker who starts the day at 100% battery can be at 30% by lunch if GPS is running continuously.

The smart fix: don't track continuously. The best systems capture location only at clock-in, clock-out, and periodic check-ins — not a constant GPS trail. That reduces battery consumption by 60–70% while still providing the verification you need.

Privacy Concerns Are Legitimate

Your crews will push back. "You're tracking me" is a common objection, and it's not unreasonable. The key is drawing a clear line between work-time tracking and personal surveillance.

Best practices for privacy: track location only during scheduled work hours. Stop tracking when someone clocks out. Give workers visibility into their own location data. Communicate the purpose clearly — "this is about accurate pay and compliance, not surveillance."

Some states have specific requirements around employee location tracking. Check your state's privacy laws before rolling out GPS time tracking, especially if you work in California, Illinois, or New York.

Geofencing: GPS's More Practical Cousin

Geofencing solves most of the usability problems with pure GPS tracking. Instead of tracking continuous location, you draw a virtual boundary around each jobsite. Cross the boundary in? The app prompts a clock-in. Cross it out? Clock-out prompt. Simple.

Geofencing Best Practices for Construction

Use polygon geofences, not circles. Circular geofences work for offices and warehouses. Jobsites are rarely circular. Polygon geofences let you trace the actual site boundary, reducing false triggers from adjacent roads and neighboring properties.

Add a 50-foot buffer zone. GPS drift and street parking mean a worker standing right at the site entrance might register as outside the boundary. A 50-foot buffer accounts for this without opening the geofence so wide it loses meaning.

Set reporting intervals at 5–10 seconds. At a 5-second update interval, the system detects boundary crossings within 5 seconds. Slower intervals mean workers might drive through a geofence without triggering a clock event.

Configure alerts by role. Supers don't need the same alerts as the back office. Let field leaders see real-time crew status; send payroll staff the end-of-day summary. Too many alerts create noise that everyone ignores.

Use smaller geofences for safety zones. Beyond time tracking, geofences around trenches, restricted zones, and active crane radii can trigger safety alerts when workers or equipment drift into dangerous areas.

Picking a System That Works on Real Jobsites

What to Look For

Offline capability. Remote sites, underground work, and spotty cellular coverage are normal in construction. The system must store punches locally and sync when connectivity returns. If a worker can't clock in because they don't have a signal, the system has already failed.

Low battery impact. Ask the vendor specifically: what's the battery impact over a 10-hour shift? If they can't answer with numbers, they haven't tested it in the field.

Geofencing + GPS together. Geofencing handles the automation. GPS provides the verification layer. You want both in one system — not one or the other.

Job code capture at clock-in. A GPS stamp that says "this worker was at 123 Main Street" is good. A GPS stamp that says "this worker was at 123 Main Street, working on cost code 4120-Electric Rough" is better. That's what turns time tracking into job costing.

Payroll integration. GPS-verified hours that still need to be manually exported and rekeyed into payroll defeat half the purpose. Direct integration with your payroll system closes the loop.

What to Avoid

Continuous tracking without opt-out. Tracking a worker's location every 30 seconds for the entire shift burns battery, creates privacy issues, and provides minimal additional value over clock-in/clock-out verification.

Systems designed for trucking or delivery. Fleet tracking and delivery route software sometimes gets marketed to construction. The use case is fundamentally different — construction workers stay on site for eight hours, they don't drive routes. Features designed for mobile workers (like breadcrumb trails and stop optimization) add complexity without value.

Vendor lock-in on hardware. Some systems require proprietary time clocks or kiosks. These create single points of failure and add cost. A system that runs on any smartphone gives you flexibility and eliminates hardware maintenance.

The ROI Calculation

Digital time tracking with GPS verification delivers 6–7% payroll savings on average, with an annual ROI of 200–400%. On a crew of 50 at $25/hour loaded, that's $78,000–$182,000 in annual savings against a software cost of roughly $3,000/year (at $5/user/month).

The payback period is measured in weeks, not months.

Beyond direct savings, GPS-verified time data improves job costing accuracy, reduces payroll disputes by giving both sides an objective record, and creates the compliance documentation required for prevailing wage and Davis-Bacon projects.

Done fighting with paper timecards? Vendoor vTime combines GPS verification, geofencing automation, and direct payroll export in one app — at $5/user/month. See how vTime works →

Sources: Kwant GPS accuracy data, Hubstaff battery research, WorkStatus geofencing data, HCSS geofencing best practices, Arcoro/ExakTime ROI data. All statistics current as of February 2026.

GPS Time Tracking for Construction: What Works (and What Doesn't)