Nabiki Walked a bit till eventually she found the library an headed inside. She walked past the more common books till she found the Reference section.
She looked up astronomy, Trig and any books she could find on sailing ships and their history.

She turned the pages of the Astronomy book to the celestial maps and began consuming every chart with her eyes as she memorized the seasonal location of the celestial primary which one used to fix the location of the stellar clusters. She paid close attention to horizon positions and their seasonal motions an positions at each time.

Gifted with an excellent memory she still only troubles herself to memorize only 20 stars.

Next she begins familiarizing herself with Triangulation theorems pertaining to grids and distance.

Already familiar with trig she breezes through that book then kicks back With her reference book of the history of sailing