RacePak Data Systems
RacePak offer some really nice kit. There Network system called VNet is great. A very simple solution to produce a modular logging and display system. There is various differing logger units including G2X and G2X-Pro, the logger dash IQ3 which is also available as a display only option.
The loggers and the display/display-logger come with inbuilt GPS and longitudinal and lateral accelerometers so the units are able to produce track/stage maps, display sector times(without a beacon) and display speed.
For full specs browse the products own pages.
