What is a geofence?
A geofence is a circle or polygon drawn on the map around a real place. The tracker's live position is checked against it continuously; the moment the vehicle crosses the line, an event is recorded and an alert goes out. It is the digital equivalent of a gatekeeper who never blinks.
Entry and exit alerts on a school route
On a school route you typically fence three kinds of places: the school gate, each pickup stop, and any area a bus should never enter. Entry at the gate tells the office the bus is back; exit from a stop confirms the driver actually stopped there rather than driving past.
- School gate — arrival and departure timestamps for every run.
- Pickup stops — proof the bus reached each stop; a missed fence is a missed stop.
- No-go zones — instant alert if a bus leaves its permitted area.
Avoiding false alarms
GPS positions wobble by a few metres, so a fence drawn too tight around a stop will flicker in and out. A radius of 60–100 metres for stops and a slightly larger one for the school works well in Indian towns. Bharat Tracker also waits for a couple of consecutive fixes inside a fence before firing, which removes almost all noise.
Who gets the alert
The school office sees every geofence event on the dashboard. Parents only receive alerts that concern their child's bus and stop, so nobody is flooded with notifications about routes they do not use.
