Geofence

Introduction

Geofencing is a core feature in modern GPS tracking systems. It allows users to define virtual boundaries on a map. When a GPS-tracked vehicle or asset enters or exits these areas, the system automatically triggers alerts or actions.

How Geofence Works

• A geofence can be a circular or polygonal area defined by latitude and longitude.
• The Discovery 4G GPS tracker continuously checks its current location via satellite.
• The system compares this live data against the predefined geofence area.
• If the asset enters or exits, the event is logged or notified based on configuration.

How to Get Coordinates from Google Maps

1. Open Google Maps
2. Search for your desired location (e.g., warehouse, school)
3. Right-click on the location and select “What’s here?”
4. Note the coordinates shown below (e.g., 10.0556255, 76.3544891)
5. Use these as:
   1. Center point for circular geofences
   2. Corner points for polygon geofences (at least 3, ideally 4–6)
6. Enter the values into the command format explained below

Note: A maximum of 6 geofences (circle or polygon combined) can be configured on any Transight telematics device.

Geofence Command Format

• Status: 1 = Enable, 0 = Disable
• Geofence ID: Unique ID (e.g., 1313, 1777)
• Alert Type: 1 = Entry, 2 = Exit, 3 = Both
• Shape: 0 = Circle, 1 = Polygon
• Latitude/Longitude: Decimal format (e.g., 10.0556255, 76.3544891)
• Radius: Only for circles (in meters)
• #: Used to separate parameters
• &: Must be added at the end of polygon commands

Command Examples with Field Mapping

Example 1: Circular Geofence

Objective: Create a 1000-meter circular geofence at 10.0556255, 76.3544891

• Status: 1
• Geofence ID: 1313
• Alert Type: 3
• Shape: 0
• Latitude: 10.0556255
• Longitude: 76.3544891
• Radius: 1000

Command format:

SET CUGF:<Status><Geofence ID>-<Alert Type>-<Shape>#<Latitude-Longitude>#<Radius>

Example:

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

Example 2: Polygon Geofence

Objective: Create a polygon geofence with 4 corner points (first point repeated at the end)

• Status: 1
• Geofence ID: 1777
• Alert Type: 3
• Shape: 1
• Coordinates:
  • 10.0535097, 76.334262
  • 10.0504267, 76.3328855
  • 10.0474386, 76.3439598
  • 10.0503084, 76.3437023
  • 10.0535097, 76.334262 (repeat to close loop)

Command format:

SET CUGF:<Status><Geofence ID>-<Alert Type>-<Shape>#<Lat-Long>#...#<Lat-Long>&

Example:

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&

Response:

IMEI: 862942074896044
Command: SET CUGF:1-1777-3-1#...
Response:
Error : 0

Save Configuration

After setting up geofences, you must execute the below command to save the configuration permanently:

SET TSMR:2

To Check Configured Geofences

Use the command:

GET CUGF

This will show all geofences currently saved in the device memory.

Final Verification

After setup:

• Ensure the device has a GPS fix
• Drive or move the asset in and out of the geofenced area
• Confirm alerts are received/logged as expected