Two 18th century handwritten notebooks relating to the navigation of merchant ships to include studies, notes, problems, and case files, created by William Shaw, July 24th 1782, the books comprise spherical geometry, spherical trigonome, oblique spherical, the use of globes, problems on the globes, tables of geography, with headings to include island or the islands of that place, chief towns or main towns, and belongs to, including European islands, Asian islands, African islands, North American islands, stereo graphical projection of the sphere on the plain of meridian, astronomical problems, calculate distance from the sun at any given time and the sun's distance from the moon, to predict an eclipse of the sun, plane sailing, distance and difference of latitude given to find the course and departure various case studies, to correct a ship's course for the leeway, to correct the dead reckoning, two journals comprising London to Madeira and Madeira to London, also Liverpool to Barbados and Barbados to Liverpool, a method of finding the apparent time at sea.