I haven’t seen much written about it here, but Pivo is working nicely for dressage riders. It is cheaper than Soloshot/Pixio, and uses software rather than beacons to track you. Simply buy the PivoPod, download the free software onto your phone, connect via bluetooth, put your phone on the PivoPod, and you are good to go. It uses AI technology to mark your horse (oblong rectangle) and then using blue tooth, tracks you. It is not perfect, if you get too far away it might mistake a dark barn door for you horse (they both look the same size!), or if you have a lot of jumps, it might fixate on the jump and lose your horse. It auto-zooms, and folks have recorded a full dressage test from C, but it really works best shorter range. The video you get is as good as your phone. Those with newer iPhones are getting fantastic 4k video. Take a look at the FB Pivo Horse page for videos and comments. It is newer technology and the developers are actively listening.
I have no connection with them, just a trail rider actually, but trying to improve my arena skills, so staying within a smaller dressage court works for me right now. I am just totally amazed at how well it works for $100. Get the silver version, as the pivopod itself can track faster than the red.
https://www.facebook.com/szoltner/videos/pcb.311888053194680/10217607625038641/?type=3&theater