Maps ? 

Well since there are none here, and I don't have any maybe the best place to start is with a book.

Celestial Navigation - With the Sight Reduction Tables from "Pub. N...

Inland and Coastal Navigation: For Power-driven and Sailing Vessels...

Emergency Navigation, 2nd Edition: Improvised and No-Instrument Met...

Navigation Workbook 1210 Tr: For Power-Driven and Sailing Vessels

Chapman Piloting & Seamanship 67th Edition