All round a Sophisticated System
The battery life of the active transponder lasts for over 1,000 hours of tracking - that's enough for 100 Ironman events.
Time consuming charging and additional hardware are not necessary.
The three day battery life of the Track Box means the setup can be done prior to the event day. To charge the Track Boxes, you can simply stack them up to 20 boxes, and charge them with just one charging device.
Besides from installing the boxes along the track, you can place them on support or leading vehicles. This enables you to increase the distance between the boxes (e.g. every kilometer) and still do a live tracking of the leading group.