TMS Geofencing and Automated Arrival/Departure Detection

Geofencing draws a virtual boundary around a location — a dock, yard, or delivery address — so that a vehicle's GPS position crossing that boundary automatically triggers an arrival or departure event in the TMS. This removes the dependence on manual check calls or driver-entered status updates for one of the most frequently needed pieces of shipment status.

A geofence is typically a radius or polygon around a set of coordinates. When a tracked vehicle's telematics or mobile app position enters the boundary, the system logs an arrival timestamp; when it exits, a departure timestamp. For high-value use cases like dock scheduling, the geofence is often layered — an outer boundary marks "arrived at facility" while a tighter boundary around the specific dock door marks "at dock," giving two distinct, automatically captured milestones instead of one.

• Facility-level geofence for overall site arrival/departure, useful for detention clock start/stop
• Dock-door-level geofence for precise spotting time, useful for yard efficiency metrics
• Delivery-address geofence for last-mile proof of arrival independent of driver-reported status
• Configurable dwell threshold that distinguishes a genuine stop from a vehicle merely passing near the boundary

Historically, dispatchers called drivers to confirm arrival at pickup or delivery, an approach that scales poorly and produces status updates that lag reality by however long it takes to reach the driver. Geofencing shifts this to an event-driven model: the TMS status updates automatically the moment the vehicle physically crosses the boundary, and check calls become the exception for genuinely uncertain situations rather than the default method of status confirmation.

Detention billing disputes are frequently caused by disagreement over the actual arrival time at a facility. A geofence-triggered timestamp, logged automatically and independent of any party's self-report, gives both carrier and shipper a neutral, defensible arrival time to calculate detention against, substantially reducing the volume of billing disputes tied to arrival-time disagreements.

Geofence accuracy depends on GPS signal quality, which degrades in dense urban areas or large multi-dock facilities where a single facility-level geofence cannot distinguish between docks. Radius sizing needs tuning per site type: too tight and legitimate arrivals are missed due to GPS drift; too loose and the geofence triggers false arrivals from vehicles merely driving past on an adjacent road. A dwell-time confirmation (position must remain inside the boundary for a minimum duration) filters out most false positives from drive-by traffic.