A character can resist being swept away by a current, if his/her dice roll result against ST + Swimming (including Swimming strength/Resisting currents specialisms) is greater than or equal to a difficulty value, based on the current strength.
Typical difficulties vary as follows:
| Situation | Typical difficulty |
| Gentle current (e.g. slow river) | 2 or lower |
| Quite strong current (e.g. normal river, normal sea) | 3-5 |
| Strong current (e.g. minor ocean current, tidal flow in estuary) | 6-10 |
| Very strong current (e.g. fast-flowing river, major ocean current, rip tides) | 11-16 |
| Irresistible current (e.g. mountain torrent) | 17 or more |
A character who fails the dice roll will be carried along by the current.