Trekipedia

Sector Quads

Quadrants were divided into numbered Subquadrants and Sector Zones. The intersection of a subquadrant and a sector zone resulted in a roughly cube-shaped Sector Grid, which was 5000 light years long and 3600 light years high along the galactic plane; the width varied by distance from the galactic core—at the rim, it could be as wide as 8727 light years. Each sector grid was then divided into a cubic grid of 100 Sector Quads, which were then further broken down into 900 ore more roughly cubical Sector Blocks, each measuring nearly 100 cubic light years (varying by distance from the galactic core). Finally, sector blocks were divided into 100 sectors, each measuring 20 cubic light years.Sector numbers were a nine-digit sequence with the first two digits representing the sector grid, the first digit of which represented the subquadrant and the second the sector zone (e.g. Sector Grid 15 was the intersection of subquadrant 1 and sector zone 5); the next two digits represented the sector quad; the next three digits represented the sector block; and the final two digits represented the sector proper. Prior to the mid-24th century, sector quads were commonly, though erroneously, referred to as “quadrants.” This practice fell into disuse, however, due to the widespread confusion it often generated.^[1]

References

• ^[1]STSC: Star Trek: Star Charts