I know of one mate who had to Dead Reckon from California to Japan because it was overcasted the entire trip. This was the route for that ship and they used their navigation logs for the time & speed on each course.
This was before the days of
GPS, SatNav and Loran. Yes they made it safely.
So plotting your DR is a good thing. In fact the DR might just save your A$$ if your
GPS goes out. Then you will be doing Celestial and Plotting your DR as you sail merrily along.
Gee!!

Not only Celestial, But also Dead Reckoning, and Coast Piloting are included in the need to know navigation skills
Oh! International & Inland Rules of the Road also are included with the above
