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     Post subject: www.cheapportugaljerseys.com
    PostPosted: February 10th, 2018, 3:49 pm 
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    Interesting Navigation Equipment Interesting Navigation Equipment May 27 Cheap Portugal Soccer Jerseys , 2013 | Author: Carey Bourdier | Posted in Education
    While you can certainly navigate a boat or ship using modern sonar, depth finders and radar, there are many pieces of equipment that can help you sail the seas and yet require no electricity. While many of these navigational instruments were invented hundreds of years earlier, they are still used today, albeit production quality has improved and the designs are sometimes a bit more complicated.


    The alidade is an interesting piece of navigational equipment. This instrument is used to locate distant objects. Once you have found the object, you use the line of site to perhaps measure the angle of the object from another specific point of reference. These instruments have been used for centuries to help create oceanic and land maps. Foresters and firefighters use alidades to pinpoint the location of a fire in a vast forest.


    Another tool often used for navigation is the three-arm protractor. This device is often used to help plot the position of a ship on navigational charts, and thus it is often transparent to allow viewing of the map or chart beneath it. The central arm is fixed in place and the other two arms can rotate. This device was invented in the early 19th century and is still used today by navigators.


    Different types of compasses also are found on ships. While there are many types of computerized or electronic forms of navigational equipment on board ships today, all ships still have high quality compasses. A high quality surveyor’s compass, for example, can be an essential tool to use if one’s electrical system ceases to function and the watercraft is stranded at sea.


    The first sextant was created by astronomer John Bird in the 1750s, although designs for the device appear several decades early. The sextant is still used today, although those created today have accuracy of 10 seconds of arc or better. One uses the sextant to measure the angles between two celestial objects, and this calculation can be used to find Greenwich Time. Knowing Greenwich Time allows a navigator to pinpoint the longitude of their ship. Typically Cheap Portugal Jerseys , measurements are taken at night and the navigator uses the position of the moon in relation to a planet or a star.


    Of course binoculars are another useful tool when one is at sea, but these days, there are extremely high-powered binoculars that you can mount onto the boat deck. A mounted binocular system typically includes the binocular, the pedestal that attaches to the deck and a carriage assembly so that you can move the binocular easily.


    Carey Bourdier loves writing reviews on precision scientific instruments. For more information about navigation instruments like a surveyor compass, or to find other surveying instruments like compass tripod, please check out the WarrenKnight site today.

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