IT+in+Navigation

=__** Navigation **__= **Navigation** is the process of monitoring and controlling the movement of a craft or vehicle from one place to another

 This video explains what happens when trying to navigate using a GPS. In this video some hardware are shown that are essential for the process to work. media type="youtube" key="DsmvTzw3GP4" height="315" width="420"

Radio navigation


A radio direction finder or RDF is a device for finding the direction to a radio source. Due to radio's ability to travel very long distances "over the horizon", it makes a particularly good navigation system for ships and aircraft that might be flying at a distance from land.

 Radar navigation


====  When a vessel is within radar range of land or special radar aids to navigation, the navigator can take distances and angular bearings to charted objects and use these to establish arcs of position and lines of position on a chart. A fix consisting of only radar information is called a radar fix. ====

Article:  This article talks about that the GPS can be unreliable at times and that it can be easily jammed by people.  http://www.smh.com.au/technology/sci-tech/gps-overreliance-driving-us-toward-catastrophe-experts-20110311-1bqhl.html.