Eli5 how do construction workers communicate the precise location of items to be moved , to the tower crane operator , is there a grid used to communicate position ?

Question

Eli5 how do construction workers communicate the precise location of items to be moved , to the tower crane operator , is there a grid used to communicate position ?

In: 3

Answer 1

But what if the operators view is obstructed ? Is the man on the ground just saying left right up down to the operator ?