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Because the same 10-minute block occurs four times on the face of the earth, the direction code indicates the quadrosphere of the earth where the bird was banded or encountered.
| Bandings or Recoveries Occurring in: |
Corner of 10 Minute Block Used |
Direction code |
| West Longitude | ||
| North of Equator | Southeast | O 0 |
| South of Equator | Northeast | S 2 |
| East Longitude | ||
| North of Equator | Southwest | E 1 |
| South of Equator | Northwest | C 3 |
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