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A politician would say "I miswrote" part of my 14 Oct, 2025 answer. Mine was unintentional.

On "triangulation" I was thinking about coming to an unknown point from three, known, directions. Wrong!
Triangulation was done with a single Triangle with one known side and two measured sight angles to an unknown point. Sometimes these sights were at night, over very long distances, to a lighted unknown point.

I'm reading The Mapmakers by Wilford and he discusses Cooks mapping of the St. Lawrence River. Pre-chronometer he likely used the transit of Jupiter's moon's for time. Apparently that was a "blink and you'll miss it" process but it was the best available at the time. From that position it was DR. Some Plane Table mapping was done on land but much was done from a ship and its DR position using a compass and taffrail log. Not perfect but a giant step up from very early maps that were based on religion, rumors, and artwork.

Triangulation was used for measuring the width of the English Channel in 1787 - over 75 kilometers- with burning lime (limelight) on the French side.

I'm sticking to my previous statement that all of this was done "With a lot of work."