From the Dressage NZ Rules Officer:
Following a review of the relevant rules it has been determined that these types of cameras, which require the rider to wear a transmitter that communicates back to the video camera, are not permitted inside the competition arena. The same position applies to newly released Smart Watches which have communication capability.
If the rider (or horse) wears the transmitter inside the competition arena, elimination will result.
The Tracking Video Camera and Smart Watches can be used in training and during the competitor’s warm up.