Where can I find nourishment understanding the edit of polar files to improve accuracy of the basic polar file?  I have explored the operation and find I still lack understanding of how the edit changes to the polar graphic display interacts with the base text file.  It looks like a powerful connection, but I keep screwing up the base file, getting changes to the data that I don't understand.  Nick, can you please comment?
Thx, pjl

thx, hefty price!!  is there an economy version?  a list of graduates?

Can anyone comment on how the route optimization algorithm works regarding interpolation of values between the values in the polar file, which represent "steps" in the  curve?  The polar edit function shows very illogical curves in some cases as I attempt to adjust values based on actual experience.  Logic says that the shape of the curve should be smooth, not have bumps and valleys.  Thx for your thoughts and comments.

Good point.  As another test, I have generated a set of polar files with minor changes with only the original input points, i.e. heading, wind speed and boat speed.  When I examine the polar edit function in Expedition, I can still see wonky curves.  I can eliminate the wonky curves by editing the displayed plot, which seems to change the data in the array of data in the original polar selected for examination.  This raised my question of how the program works.  Meaning does the optimization process use the data from the smooth curve formula that seems to be generated by a curve fitting process to the plotted data.  Does that make sense?  Maybe Nick will add some knowledge to this thread that will eplain what's going on.  Thx, pjl