The Basic Navigation Set provides the essential navigation instruments required for basic navigation, such as finding your position, your range, and bearing to a destination. The set, packaged in a clear, reusable plastic case, includes four tools: Weems Protractor (#255) (an updated version of Breton and Portland plotters) that can be used to lay off course or bearing, measure distance between any two points, plot a position on a chart from given set of coordinates, or determine coordinates of position on chart. #145 - Parallel Rules for finding bearing and direction. # 262 - 6 inch Dividers for measuring distance. # 1141 - #2 Navigation Pencil for making notations on the chart and in the navigation log. Pencil sharpener and reusable plastic pouch included.