The transponder is installed on the vehicle or carried directly by the competitor.
When the transponder passes on the ground loop or antenna, it is identified by the decoder.
The accuracy varies depending of the transponder used.

For more information, visit the page transponders comparison.

Transponders used with passive loop

These transponders are recommended for motorized sports with high speed.

Transponders used with active loop or antenna

These transponders are recommended for non-motorized sports or with low speed.