This reminds me of pre-GPS systems like LORAN [0], where it also involves ship navigation by demarcating everything into patterned regions. [0] https://en.wiki

This reminds me of pre-GPS systems like LORAN [0], where it also involves ship navigation by demarcating everything into patterned regions. [0] https://en.wikipedia.org/wiki/LORAN https://en.wikipedia.org/wiki/LORAN