Spread spectrum telemetry is short range but acceptable for most race circuits, using a set of Spread Spectrum Radio modems. These can transmit data at up to 38400 baud providing enough information to give an accurate picture of vehicle performance and sophisticated diagnostics of engine operating conditions.
GSM telemetry can be run from any location that is in GSM mobile phone range. This could include watching your race car's telemetry as far afield as interstate or even overseas across the mobile phone network. The phone network supports data communications at speeds up to 9600 baud, approximately 1.2 kB/s. This allows more than 20 channels of information to be transmitted 20 times per second.