|When people think of
instruments that help with direction finding, the first one that
comes to mind is probably the magnetic compass. It is the oldest
instrument for navigation and has been a vital tool for
navigators at sea for centuries.
No matter where you stand on
earth you can hold a compass in your hand and it will point
toward the north pole. What an unbelievably neat and amazing
thing! Imagine that you are in the middle of the ocean, and you
are looking all around you in every direction and all you can
see is water, and it is overcast so you cannot see the sun...
how in the world would you know which way to go unless you had a
compass that told you which way is "up"?