Thanks, Dennis. How did you arrive at 10 miles. Sent from my iPhone
> On Apr 5, 2024, at 5:31 PM, Dennis C. via CnC-List <cnc-list@cnc-list.com> > wrote: > > > Personally, I think sailing to polars can be challenging. I prefer to use > VMG. VMG rules for windward/leeward race courses! Bear with me on this. > > First, a couple of definitions used by Touche's Nexus instrument system. > > Velocity - speed and course > VMG - velocity made good wind based. The velocity directly upwind or > downwind. > WCV - waypoint closure velocity. The velocity made closing on the set > waypoint > > Okay, if your instrument calculates VMG (wind based), simply steer the boat > to maximize VMG. Done! > > If your instruments do not calculate VMG (wind based), here's how to get your > GPS to closely approximate it. First, many GPS systems show VMG which is > actually WCV when a waypoint is set. If you set the upwind (or downwind) > mark as the waypoint, WCV will incur more error as you approach the layline. > Visualize it. As you approach the layline, your WCV will decrease to zero as > you near 90 degrees to your course to the mark. (If you overstand, WCV will > turn negative as you've sailed past your mark.) > > So, set a waypoint 10 miles directly upwind or downwind of the race mark. > Now your GPS WCV will closely approximate VMG (wind based). Steer to > maximize WCV and your course(s) to the mark will be optimized. > > -- > Dennis C. > Touche' 35-1 #83 > Mandeville, LA > > Please show your appreciation for this list and the Photo Album site and help > me pay the associated bills. Make a contribution at: > https://www.paypal.me/stumurray > Thanks for your help. > Stu Please show your appreciation for this list and the Photo Album site and help me pay the associated bills. Make a contribution at: https://www.paypal.me/stumurray Thanks for your help. Stu
