Arc - A portion of a circle. The circle in this case in the Earth's surface., Compass - One leg of this has a pencil attached to it and it is used for swinging arcs and circles., Compass Rose - A circle graduated in degrees, clockwise from 0 degrees at the reference point to 360 degrees and sometimes also in a compass points., Course - The intended horizontal direction of travel expressed as angular distance from a reference direction clockwise from 000 through 360., Course Line - Line drawn on a chart going in the direction of a course., Heading - The actual direction the boat's bow is pointing at any given time., Knots - A knot is a unit of speed equal to one nautical mile per hour. Speed, Nautical Slide Rule - Designed to solve Speed, Time and Distance problems., Line of position - A line of bearing to a know object, which a vessel is presumed to be located on at some point., Longitude - Lines on a chart that run north and south referred to as meridians., Meridians - Line of longitude on a chart, Nautical Mile - For most navigation purposes we use 2000 yds as this., Parallels  - Lines of latitude on a chart, Position - This refers to the actual geographic location of a boat., Range - Two or more fixed objects in a line., Reciprocal Bearing - A bearing that is 180 degrees from the original bearning., Relative Bearning  - Bearing to an object in relation to ship's head, Parallel Ruler - These are two rulers connected by straps that allow the rulers to separate while remaining parallel., Weems Course Plotter - It is a rectangular piece of clear plastic with a set of lines parallel to the l ong edges and semi-circular scales. , Dividers - These are used to measure distance on a scale and transfer them to a chart.,

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