During 1st and 2nd World War, humanity cannot hide his excite to invent new things even under the worst times. Some of them shed light on today’s indispensable tools. One of them is a kind of navigation tool.
Today’s navigation tools works thanks to GPS technology. GPS means Global Positioning System uses 27 earthorbiting satellites. 3 of these satellites are reserved if any of them fails. Firstly, U.S. military created this system for military navigation but then opened this system to everyone.
This first navigation tool does not use GPS technology. There is a roadmap wrapped up reels and while the car moves on the road, it moves according to car movements so that driver checks if he is on the right way.