I understand that there has been previous threads on this topic.
Just thought id let people know that i used the MAP MY RUN app for our downwinder last night and it worked a treat.
its totally free, can tell you your time, distance fastest and average speed.
worth looking at if you don't want to spend a tonne on a watch or GPS unit.
www.mapmyrun.com/routes/view/57941752
was interesting.
had to launch off the rocks and paddle out thru a channel, was an awesome calm way to start, what turned into a pretty true downwinder.
looking forward to doing it again, but with more crew.