100 %
plot course on paper. (mostly ded reckoning, the realnav mod doesn't come close enough to the accuracy one obtains in real life (using sextant with Nautical Almanac and HO 211, HO 229, HO 249, or NAO sight reduction tables))
use whiz-wheels and sliderule.
use maneuvering board.
do x1 TC patrols occasionally.
when strapped for time, just run the academy convoy for practice.
retired? of course
