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

There are guys on the ground that tell them where to move the item. If the crane is huge, they use radios; if it isn’t, they use flags and maybe radios. (Similar fashion to the guys you see directing jets at an airport, waving them left or right)