Cellular GPS Collars (GSM)

The Cellular collars consist of a Hawk105 (GPS - GSM) device that calculates the animal’s coordinates using a GPS. This data is then sent via the GSM network as a text message (SMS) that you can download from the internet using HAWK software.

The unit can also provide temperature readings at specified time intervals. For advanced users we even provide the option of downloading data on the accuracy of individual fixes, including details on 2-D / 3-D readings and the positional dilution of position (PDOP). The data is stored on a secure database and you can download this whenever required. There is the option to change the frequency and schedule of readings by sending a text message (SMS) to the unit. Doing so you can specify time intervals for your data, such as hourly readings, from 6am and 6pm or for specific times during the day.

Power Consumption

Power consumption of the unit varies depending on the number and frequency of readings you need – we estimate a battery life of 5 readings per day for 2 years for each ‘D’ size battery. The number of batteries you can specify for a unit depends on the size, age and species of animal that you want to track.

When an animal moves out of cellular coverage a beacon (RF) transmitter is activated automatically, letting you locate it using standard radio tracking techniques.

Data logger option

You can also arrange for a data logger to be attached to the unit so that readings are taken and saved even when there is no cellular coverage. Later these can be sent on when the animal moves back into an area with cellular coverage. The data logger can store 20 000 readings on non-volatile memory, meaning data cannot be lost when the batteries eventually fail.

Data Viewing on Google Earth

The Collar data can be viewed on Google Earth so one can see exactly where the animals were with very high resolution satellite imagery.

Collar functionality

Cellular collars have three extra functions that can be activated by the user. This consist of Forwarding, the “Where is” function and Zones function.

1. Forwarding function
The Forwarding function allows the user to receive a text message (SMS) on their mobile phone with the GPS coordinates of the unit as soon as it is sent by the unit.

2. “Where is” function
The user sends a text message (SMS) from a mobile phone such as “Where is Unit x” and they receive a text message with the animal’s latest GPS location.

3. Zones function
No-Go or alert zones can be drawn on a map using the HAWK software and whenever the unit sends a GPS location from outside zone, the user will be alerted immediately via text message (SMS). One can choose two types of zones, normal zones and emergency zones. A “Normal Zone” violation will notify the user by text message (SMS) and the “Emergency Zone” will notify the user by missed call and text message (SMS) and the user will also receive a phone call from the data control centre.

Tags & Receivers

The Tags & Receivers system consists of two parts. The first is a digital tag receiver mounted on a collar with a GPS device that determines it’s position to within 5 meters. The second part is the tags with unique ID numbers and temperature sensors. The tags can be mounted onto animals by various means due to their small size (e.g. collars or implants). At schedule reading times the digital receiver records its exact GPS location as well as the location (direction from unit) and distance (in terms of signal strength) of each tag within range. The signal strength is only to be used as a rough indicator of distance from the receiver unit as the animal itself, as well as the environmental conditions & surroundings can affect signal strength. The tags’ battery life is estimated to last approximately 3 years on one penlight lithium battery.

The data from each scheduled reading is then saved onto a Data Logger that can store up to 20 000 readings. The data can be transferred to the uses via GSM network (if the receiver is attached to a Cellular collar) or via Satellite (if the receiver is mounted on a Satellite collar) or stored on a Data Logger Radio Collar and retrieved by locating the unit by means of radio tracking and manually removing the collar after a specified time period.

Vulture on Google Earth 1
Vulture on Google Earth 2


Red Hartebeest
Cellular Collar for a lion

- Cellular coverage
- Computer
- Internet facilities


- Pinpoint accuracy
- Tracking in the comfort of your own home
- GPS coordinates plotted on map
- Selection of daily or weekly reading schedules
- Reprogrammable while animal is in the field
- Self-testing capability
- Low power consumption
- VHF tracking as back-up in case of no cellular coverage
- Storing up to 240 readings in case of no cellular coverage
- National coverage area, user choice of cellular network
- User friendly software
- Geo-zones (optional)
- Data analysis (optional)
- GPS coordinates sent to cell phone (optional)


Radio, Cellular and Satellite Collars, Data Loggers, GPS-UHF Download collars as well as Abdominal Implants can be refurbished at greatly reduced cost.

Refurbishment implies the recycling of the transmitter with installation of a new battery pack enabling additional usage out of the unit. The transmitter is retrieved from the casing of the old/expired unit and then re-fitted into a brand new casing with new batteries.

  Contact sales for more information