I find it hard to believe that a GPS based system is ever going to have the resolution required to accurately dissect the dynamics of water skiing.
To the engineers; is there not a small scale GPS-equivalent system out there where you’d only require two signal senders in the boat and a receiver on the ski to triangulate the receiver position. I don’t know what type of signal you’d use, infrared, ultrasound, radio wave, laser….but surely in this day and age there’s something that can provide an accurate (resolution of a few cm), dynamic, wireless triangulation within say 25m radius?