By using our communication own protocol we have been able to shorten the messages send between the unit and our server ( ¼ of other systems). The end result is less GPRS costs. Another benefit of this is that it’s very difficult to interpret the message for third parties who do not know the protocol. This way we have become a high security/privacy. Our units are made in Europe.
As extra option a text terminal can be installed so that two way communication is possible between you and your driver.