| Condition | Modifier to Discovery Score† |
| Desert or plains terrain | +1 |
| Forest, hills, or marsh terrain | +2 |
| Mountain terrain | +3 |
| Location is traveled to or from often | -4 |
| Location is mobile within the territory | +4 |
| Location is unusually large | -2 |
| Location is unusually small | +2 |
| Location is deliberately hidden | +2 to +6 |
† Adjustments are cumulative, but the minimum discovery score = 1.