Ground-based GPS tracking

Don Johnstone
wrote:

I may be wrong but I thought that a similar system
was employed at one of the european championships this
year.
The downside that if the information is available to
spectators it is also available to competitors.

It's being used at many race sites. The Comp Director can select a
delay (say: 20 minutes) in the display. No problems for the fairness
of the sport.

Aldo Cernezzi