Just dawned on me - you riding in a river or anywhere with a current?

On Wednesday night here we did a little surfing and although our river has finally slowed down there is still a current. I'll run about 10.5-11mph downstream, the drop it to around 8.5-9mph to run back upstream. I'm PP Stargazer GPS based so gotta make up for the moving water underneath us.

Although I didn't think it made much of a difference initially, my daughter wakeboarding was asking for more speed changes too. Ran her 21.5 downstream, 19.5 upstream to keep her happy.