A nice article about the development of accurate chronometers: http://www.nmm.ac.uk/explore/astronomy-and-time/time-facts/harrison
Without accurate chronometers, the measure of longitude was always difficult as the OP notes.
An excellent post - I very much enjoyed reading it.
Hi guys
First post, and first day of playing the game. This guide is super - thank you to the OP.
But yes - may be a simple gunnery guide, as I killed a lot of fish today working it out for myself!
Yo ho ho.