American Practical Navigator Cir 1918 book used by the US Navy

[River Rat 1]

When in SBU XI when getting trained for my NEC 9533 our QM who was training us told us to get the modern copy of this book. Saw this on eBay saw it was once owned by a BM on the USS Montgomery a four-piper destroyer. You look through the book the mathematics would make a modern-day US Navy officer get lost.

[River Rat 1]

The USS Montgomery and anther page out of the book.