ash wrote:If you applied your technique when crossing the English Channel, then you would extend your journey a fair bit because you would be heading for your destination and ignoring the fact that the tide was going to change direction before you got there.
Although the "fair bit" has never seemed as important to me as it seems to others.
Assume a 65 mile journey.
Assume it takes 12 hours.
Assume a constant average of 1.5 knots of tide over the whole journey. (At the change zero, maybe a smidge over 3knots at the peak.)
If my trig is right the boat sails 67.45 miles instead of 65.
There's a case to be made that that's important racing but of less concern when cruising.
Personally, I'm a member of the 'Guestimate the total bias' camp, and obviously given the duration sailed is often 12-16 hours steering the course of the destination all the way until something was identified on land wouldn't often be far off.
Signed,
Mark the Heretic.