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 ?

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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 ?

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If you are close enough to see we used hand signals. Thumb left or right to move the boom in that direction. Two thumbs facing each other boom in. Two thumbs apart boom out. If you point up and rotate your hand pick item up. If you put your palm up and pinch your thumb, pointer and middle fingers together repeatedly it means pick item up slowly. Point down or pinch fingers with palm down was let item down.

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