Dead Reckoning

While beating into the wind you plot a series of course lines.

You cover 80 miles and plot 35 course lines.

How do you find a single equivalent course and distance?
What is that called?
What tables do you use?
How do you account for Set?
How do you account for Drift?

If you wanted to use a landmark like a water tower 8 mi to the east of
your departure point as a departure how do you account for that.

Joe