Armed forces have been using variations of grid maps to plan bombardment since time immemorial. Do you really think that before GPS people just walked around

Armed forces have been using variations of grid maps to plan bombardment since time immemorial. Do you really think that before GPS people just walked around lost all of the time? https://en.wikipedia.org/wiki/Ordnance_Survey_National_Grid https://en.wikipedia.org/wiki/Ordnance_Survey_National_Grid https://en.wikipedia.org/wiki/Military_Grid_Reference_System https://en.wikipedia.org/wiki/Military_Grid_Reference_System