HOW IT WORKS

In both GSM and true Satellite communications, a signal is continuously beamed to a GPS antenna giving the device its exact location, at predetermined timings. The transponder then sends a report to the servers giving the exact location and status of the item being tracked, which is then transposed onto a system where mapping software is stored and displays these results on a monitor. The two methods of communication to the servers are as follows:

GSM

... works by utilising the local mobile networks and sends text messages to a modem which can translate information which can be transposed onto the mapping software package.

Advantages - Good for short term use in one particular country where SMS is cost effective without the need to enter into 12 month contracts. Transponders are more cost effective.

Satellite Communications

Iridium, one of our providers of satellite communications, has a pan global coverage with a constellation of 66 satellites. No matter where on the earth, you will be able to see 3 satellites at any one time, giving you greater reliability of service.

Advantages - True Global coverage and is ideal for longer term contracts. Messaging is charged at a fixed cost per message no matter where the transponder is located, whether at sea or remote locations. Transponders can report every 20 seconds