Anonymous wrote:
nothing is in real time, regardless of if on radio or moblie phones.
Sorry guest but your wrong. Satnav systems in cars are real time. They are constantly receiving information from the GPS sats and from this information the driver can see his/her position on their data unit and if the data unit has something like Tom Tom loaded onto it then the driver will be able to see where they are.
I think you are talking about what is displayed at the office and not in the car. The car is real time, the office is not real time.
I know where you coming from but will explain it so that others know about it. The office does not hold real time positions for the car and any company that claims that they do this is LYING. Simple as that.
There are a number of ways that the office knows where a car is and this is done by:
1. The office sends out a request to the car and the car reports back its position. This is done without the driver even knowing its happening. The position is then displayed on the office gps mapping system.
2. The position of the car is sent back based on some rules . i.e. car has moved xxx amount of meters within so much time, the car is reporting back over a period of time or the car has crossed a boudary.
The main problem with systems that report back the position of the car is the amount of data being sent and as it gets busier then the data channel can become clogged up very easily. This is why on various systems its best to make sure that the "Free" cars are reporting back more often than cars that are on the way to a job or cars on jobs. Cuts down traffic.
There are now other systems where the car position is not sent back to the base and when a job is sent out its looking for cars that are within a certain distance of the acutal pickup point of the job rather than 1st car ranked in an area. All the intelligence is within the cars data unit. This cuts down data traffic and its working on where the car is at that time and not where the car was XXX amount of minutes before hand.
Anyway, I hope this has cleared up some points.
regards
RadioMan