Understand. ' Navigation Numbers'.
Back in the day... that was "normal" for Grade 7 maths. All sorted by end of Year 8...
you want a challenge ? - Try terrestial use of a marine sextant.
My Old Man used one for tree-felling on his hobby farm, would calculate exact height... and drop them within a foot of a fence etc. Great entertainment for the neighbors... and he never ever gave them Full Value !
But then again, he went to sea aged 14, and learned everything on the job. Used to have some of his text books, a lifetime ago.
They had to know the load-carrying ability of various species of timber planks etc. as in bouancy .
- In differant oceans.... Salinity varies depending on location AND season !
Useless extra: - My son bumped into a cranky Senior Citizen at his work. Long story/Shrt, turns out he had been a sailor... under my old Man's command. - Son was disappointed to be told said Grandfather was.... "an illegetimate Captain".
But interesting, as we now know where HIS temper comes from !!!


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