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Plotter (instrument)
In navigational instruments, a plotter is an instrument which marks the position of a vehicle on a map or chart. Types Several types of plotters exist. These include manual and electronic plotters: Manual plotters * The parallel rulers plotter * The * The Breton plotterSemi-electronic plotters * Yeoman plotterSee also * |
Set Square
A set square or triangle (American English) is an object used in engineering and technical drawing, with the aim of providing a straightedge at a right angle or other particular planar angle to a baseline. Types The simplest form of set square is a triangular piece of transparent plastic (or formerly of polished wood) with the centre removed. More commonly the set square bears the markings of a ruler and a half circle protractor. The outer edges are typically bevelled. These set squares come in two usual forms, both right triangles: one with 90-45-45 degree angles, the other with 30-60-90 degree angles. Combining the two forms by placing the hypotenuses together will also yield 15° and 75° angles. They are often purchased in packs with protractors and compasses. Less commonly found is the adjustable set square. Here, the body of the object is cut in half and rejoined with a hinge marked with angles. Adjustment to the marked angle will produce any desired angl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Breton Plotter
A Breton plotter (French: ), also known as a Portland course plotter or Weems protractor named after later manufacturers producing similar devices, is a navigational instrument used for nautical navigation with Nautical chart, charts. The Breton plotter contains a ruler with a rotating protractor that serves as a compass rose, allowing navigators to plot a course on charts by aligning the North of the ruler with the North of the chart. History The Breton plotter was invented by Captain Yvonnick Gueret, a Breton seaman who developed the plotter during his experiences teaching navigation with a () by Jean Émile Paul Cras. Gueret was a commander in merchant vessels, served on small fishing boats, delivered private yachts, and later taught navigation. While teaching, he found that students were having trouble using the more complex plotters common at the time, and decided to make his own. Gueret's device went on the market in 1979 to acclaim from publications including ''Yachting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Course (navigation)
In navigation, the course of a watercraft or aircraft is the cardinal direction in which the craft is to be Steering, steered. The course is to be distinguished from the ''Heading (navigation), heading'', which is the direction where the watercraft's Bow (watercraft), bow or the aircraft's Nose cone, nose is pointed. The path that a vessel follows is called a track or, in the case of aircraft, ground track (also known as ''course made good'' or ''course over the ground''). The intended track is a route. Discussion For ships and aircraft, routes are typically Great-circle distance, straight-line segments between Waypoint, waypoints. A navigator determines the ''bearing'' (the compass direction from the craft's current position) of the next waypoint. Because water currents or wind can cause a craft to drift off course, a navigator sets a ''course to steer'' that compensates for drift. The helmsman or pilot points the craft on a ''heading'' that corresponds to the course to s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Navigational Equipment
Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another.Bowditch, 2003:799. The field of navigation includes four general categories: land navigation, marine navigation, aeronautic navigation, and space navigation. It is also the term of art used for the specialized knowledge used by navigators to perform navigation tasks. All navigational techniques involve locating the navigator's position compared to known locations or patterns. Navigation, in a broader sense, can refer to any skill or study that involves the determination of position and direction. In this sense, navigation includes orienteering and pedestrian navigation. For marine navigation, this involves the safe movement of ships, boats and other nautical craft either on or underneath the water using positions from navigation equipment with appropriate nautical charts (electronic and paper). Navigation equipment for ships is ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
