I used the "Rowing' activity on my Fenix 5X, and I immediately noticed an annoying thing about how the pace (minutes per 500 meters, in this case) is graphed. When I was stopped, I had no pace (you could say the pace value became infinitely large), but this appears on the activity graph as zero, the fastest possible pace. As the boat slowed down, the pace value got lower on the graph, like it ought to, but when the boat finally came to a complete halt, the pace value shot up to the top of the graph. Here is an example: https://connect.garmin.com/modern/activity/2329728239