Jim Donohue wrote:
In many places you use the numbers from last time. Many of the numbers are
published in guides or privately.

Local knowledge is handy.

You can also set up the course to
minimize exposure.

You mean, like plotting a course using piloting techniques?


In general the errors are area wide. You work out the correction from known
objects. You use radar and the bottom to assure yourself you did it
correctly.

You mean, like using piloting techniques?

Go slow when in doubt.

Why would you have any doubt? Don't you have absolute faith in your GPS?