Track Position of a Car during the Race

[poojyum]

Hello all,

I would like to know what is the method the race organisers use to keep track of which position each car is on the track thru out the race?

I understand from an article elsewhere on this site that each team gets the precise position of its car on the track thru "telemetry". Do the race organisers use something like this?

Thanks,
Jagan.