Part I (short video):


Part 2 (longish):

Pretty sure it's software jn1 made himself called sailplay,
Ha Ha Carl got smoked by Trousers ??

Now days you can send up a drone and do the same thing, but back in the day..... . First time I have tracked three participates.

ZeeGerman: it's custom software I wrote 8 years ago. OpenGL/ffmpeg based running on Linux OS. Software was mothballed until I brought a GW60 GPS watch a month ago

Cool stuff!
I am full of awe for anyone who has the idea, skill and patience to programme such utterly useless and delightful entertainment.
Ooooops, hang on, it might even be of value as a training tool: Isn't this what was suggested every PWA sailor should use to make speeds comparable in another thread?
Anyway, I like it just for those little windsurfers pacing back and forth and the speed given for any moment.
Keep it up!