Sail performance software, free

Above is output from a free program developed in France called GPSActionRelay. It is written in Java, and will suppossedly run on any operating system. Features include replay of several boats in a regatta, polar diagrams, VMG, speed averages, etc. It looks pretty complicated but apparently is used by some sailing teams and a number of geeky windsurfers. I’d like to know what hardware they carry on their boards at 46.7 knots (yi!), but couldn’t find any information. A Garmin wearable Forerunner perhaps? And if so couldn’t heart rate be graphed to speed?