@VONMAN - Yes, we have used it a few times. The challenge we are having is getting the software person to act in a timely manner so lots of delays.
@swbca - thx, it is clearly a prototype thing right now, somewhat cumbersome and heavy and potentially fragile if not careful. You hit on another challenge, having it be accurate per your rope 'slack' effect. More of our playing with it has been with intermediate skiers and trying to show them how wide one actually has to be to make a buoy. The knowledge is simply an angle relative to the pylon, the system turns on a light when the angle has been achieved, each angle is programmed in to the software so when rope length is changed, you set the angle on the device.
It turns on a light, the first attempt was a white light, no good, way too hard to see depending on sunshine. Red light is better. We will keep tinkering. We can integrate a timer, the key is what to make it do, for instance steady light (good), blinking light (sorry buddy, you just missed that buoy:-). Another thing about the light, there is a time delay to when you as a human acknowledge it which means you may not really be on time. Also, the first time you trigger the light, you are technically behind if you are not changing direction by then. My buddy loves to tinker with stuff and create 'relatively useless' things so we are having some fun with it.
And to JTH, please don't give me the Eric Lee award for crazy ideas 🤣