The Moon has been divided into 30 quadrangles by the United States Geological Survey at the 1:2,500,000 map scale.
[2] The quadrangles are numbered in bands from north to south.
Each band is then divided into a latitude-dependent number of quadrangles.
At the 1:1,000,000 scale, there are 12 latitude bands, 6 in each hemisphere.
The bands are then divided into quadrangles, but unlike the 1:2,500,000 system, the seam is placed at +10° longitude (so 0° longitude is in the middle of a quadrangle), and the numbering within a band starts between −80° and −90°: