Gives us a picture of how the nation camped. In a big wheel around the tabernacle. The levites were in the middle, around the holy tent, the 11 tribes were in blobs around that, always in the same order. God’s presence at the centre, like heaven.
Family is all. Within the tribes, you camp in your clan and in your family.
And when they moved on, they left in the same order each time, and set up camp the same as before.