I'm always disappointed that these systems are so hard to reason about. Plus codes are better than hashing schemes, but still require base 20 math. It's not cle

I'm always disappointed that these systems are so hard to reason about. Plus codes are better than hashing schemes, but still require base 20 math. It's not clear to me what they're for. MGRS is also based on 100x100km grid squares and it just uses easting and northing from the southwest corner. e.g. 4QFJ 1234 5678 is in square 4QFJ, at 12340m east and 56780m north with 10m accuracy. 4QFJ 12341 56789 is is in square 4QFJ, at 12341m east and 56789m north with 1m accuracy. If there's a football field roughly half a kilometre to the north, that would be 4QFJ 123 573. At the edge of the grid square, you may define an easting or northing that exceeds the bounds of the square. That's also fine. MGRS is a much more complicated system for computers, but humans can create new coordinates and express the precision of their location relatively easily when working in a local region.