This invention uses the force of the Earth's magnetic field for its operation. The compass
was of fundamental importance to navigation, because it allowed sailors to orient
themselves on the open sea without having to observe the stars (which cannot be seen on
cloudy nights or during the day). With the development of satellite-based global positioning
systems, the use of compasses has greatly declined. However, because of their versatility, low
weight, and low cost, compasses still have a place in some sporting and recreational activities.