Thanks, Eckas. Wow, that looks pretty serious. While I have Garmin devices for cycling and running, it hadn't occurred to me how easy it would be these days to record your speed when sailing. That's how long I've been away! Good to see that there are people of my vintage in your club (one year younger than the upper end of of the Grand Master age group !).
Back in the 80s I enjoyed reading the reports of speedsailing records in the magazines and still remember the images like those below of Pascal Maka and Fred Haywood blasting to new marks (taken from scans I made of articles in my windsurfing magazine collection, before I gave it to another forum member a year or so ago).
Now I'm inspired to get out on the Lake again on my old 8'9" fibreglass board (bought from the old Performance Sailboards shop in Flinders St) to relive some of my younger days ! However, I'm under no illusion about how much the equipment and techniques have changed - I happened to buy an issue of UK Windsurf back in 2008 that had an article by Peter Hart explaining those changes in great detail, in the context of telling the story about a guy of my vintage who was making a comeback with equipment from 1990.
Greg