NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Course to steer. Has anybody come across this little rule of thumb before?
From: Lu Abel
Date: 2008 Jun 18, 08:48 -0700
From: Lu Abel
Date: 2008 Jun 18, 08:48 -0700
Tony: I haven't heard of this rule-of-thumb, but geometrically it makes a lot of sense -- a 6 degree course offset will take a vessel 0.1 nm sideways for every 1.0 nm of forward progress, which is what you'd need for a beam current of 10% of vessel speed. And if I work out the plot for a bow or quarter current, 4 degrees is about right, too. Lu Abel Tony wrote: > For every 10% of tide to speed > > Adjust your course by � 6� if the tide is on your beam > Use � 4� if the tide is on your bow or quarter > > E.G. If you have 2 knots of tide and your speed is 10 knots; the tide > is 20% of your speed. > Adjust your course by � 12� if the tide is on your beam > � 8� if the tide is on your bow or quarter > > > > --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---