In the not so very recent past a half life time ago when we were searching for where we are going. Before ipoD Days before Garmin I remember that because I was at sea and my Day’s work was to find my X : my lat/long : my updated last position X/Y
Assuming that l got yesterday’s X within reason, l had to deduce reckon from a log of course and speed over 24 hrs from 16.00 hrs PZX yesterday until Today.
A sextant sun sight to capture the horizon angle @ 10.00am c/f. an afternoon 14.00 solar angle, Can actually put you @ X. After a days work.
X Somewhere important along a Line of Position, and in a bit of a cocked hat of uncertainty you are about there on a paper chart.
Plotted by instruments l played Compass & HB pencil.
I would proceed from standing on deck with a time and an angle , to work on , with my almanac and sight reduction tables , reduce and deduce and with HB pencil produce , a Line of Position.
