There is this paid iOS/WatchOS app named Waterspeed (monthly subscription) which reports at the end of an activity the best pace or speed per specific duration and distance, not just best overall and average. I personally use it for standup paddle training and downwind races as it allows me to know how my preparation and equipment affects my performance. Example of increments are:
Best avg. speed over 10s
Best avg. speed over 30s
Best avg. speed over 60s...etc.
Best avg. speed over 100m
Best avg. speed over 500m
Best avg. speed over 1,000m...etc.
It would be great if such data could be available in Garmin Connect. I am sure many athletes would find this useful, not only for sailers and paddlers.
Thanks, Nico