Geofence
Introduction
Geofencing is a key feature in GPS tracking. It allows users to define virtual boundaries on a map. When a vehicle or asset enters or exits these boundaries, the system can trigger alerts or actions.
How Geofence Works
- A geofence can be circular or polygonal.
- The GPS tracker regularly checks its position via satellites.
- The system compares the location against the defined geofence.
- When the boundary is crossed, it logs or notifies the event.
Getting Coordinates from Google Maps
- Open Google Maps.
- Search for your location (e.g., office, school).
- Right-click the spot and select "What’s here?"
- Copy the decimal coordinates shown (e.g., 10.0556255, 76.3544891).
Use these coordinates:
- As the center for circular geofences.
- As corners for polygon geofences (3–6 recommended points).
Geofence Command Format
- Status: 1 = Enable, 0 = Disable
- Geofence ID: Unique number (e.g., 1313)
- Alert Type: 1 = Entry, 2 = Exit, 3 = Both
- Shape: 0 = Circle, 1 = Polygon
- Latitude/Longitude: Decimal format
- Radius: In meters (only for circular type)
- #: Parameter separator
- &: Required at end of polygon commands
Circular Geofence Example
Objective: Create a 1000-meter circular geofence at 10.0556255, 76.3544891
SET CUGF:1-1313-3-0#10.0556255-76.3544891#1000
Response:
IMEI: 862942074896044 Command: SET CUGF:1-1313-3-0#10.0556255-76.3544891#1000 Response: Error : 0
Polygon Geofence Example
Objective: Create a polygon geofence with 4 corner points.
Coordinates:
- 10.0535097, 76.334262
- 10.0504267, 76.3328855
- 10.0474386, 76.3439598
- 10.0503084, 76.3437023
- (Repeat the first point to close the shape)
Command:
SET CUGF:1-1777-3-1#10.0535097-76.334262#10.0504267-76.3328855#10.0474386-76.3439598#10.0503084-76.3437023#10.0535097-76.334262&
Save the Configuration
After setting geofences, save to memory:
SET TSMR:2
Check Configured Geofences
To view saved geofences:
GET CUGF
Final Checklist
- Confirm GPS fix is available on device.
- Move the vehicle inside and outside geofence area.
- Verify alerts or logs are triggered correctly.