| Forwarding Direction | Condition |
| East | δx > 0, δy = 0 |
| West | δx < 0, δy = 0 |
| North | δx = 0, δy > 0 |
| South | δx = 0, δy < 0 |
| North-East | δx > 0, δy > 0 |
| South-East | δx > 0, δy < 0 |
| North-West | δx < 0, δy > 0 |
| South-West | δx < 0, δy < 0 |