And because it's pairs are increasing in area, I can state that I live in IO93 and it narrows it to:

https://www.karhukoti.com/maidenhead-grid-square-locator/?gr...

or I could give the next 2 characters to narrow it to a 1km x 1km (roughly) area that covers my town, or the 2 letters and 2 numbers that give a small area that pinpoints 2-3 houses on my street.

It's not really any more complex or hard to remember than a standard postal code or zip code.