How professional navigators plan their maneuversA maneuvering board is the essential tool for solving relative motion and other vector problems collision avoidance, analyzing radar intercepts and wind/current questions. This polar-coordinate chart, based on the U.S. Navy's DMA 5090 chart, allow quick and easy plotting of bearing, distance and speed vectors. An exact copy of the U.S. Navy's DMA 5090 Maneuvering Board Pad of 50 sheets, printed both sides Measures 13" x 14"