submarines, which can remain submerged for extended periods and operate nearly without visibility, rely heavily on the Inertial Navigation System (INS) as one of their primary systems. This instrument can determine the movement and orientation of the submarine without needing external landmarks to aid the crew. This ensures safe navigation, especially when the sea obstructs most other forms of communication.
Moreover, the crew possesses additional methods to ascertain their location. They can integrate these calculations with comprehensive maps detailing the underwater landscape and employ various protocols to minimize the potential for mistakes. Thus, even without GPS capabilities like we have on land, submarines utilize different options to avoid disorientation during missions.