If you are unsure of your location on this planet, one of the many things that occur to your mind is a GPS system which can help you spot your location on globe. Thanks to United States govt for the idea and implementation. All we need is a GPS receiver and an unobstructed Line Of Sight to four of 31 GPS satellites in operation and there you go!
One of the most interesting questions is how to keep track of oneself if one were traveling in extra terrestrial space? Certainly it is far from possibility to launch GPS satellites that cover the universe.
Pulsars are rapidly rotating neutron stars that emit a beam of radio waves. The rotation rate is amazingly coherent to striking precisions. It is no longer a mere possibility but a transparent truth that such radio beams can be used for navigational purposes. And what more? They penetrate boundlessly in this very universe which enables one to navigate with precision in free space.
Thus radio waves from pulsars enables us to navigate in free space with no difficulty. Now u cannot lose ur way!!
I hope you have seen the unseen.
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