Per/Hard
Defaults: None

This is the non-combat equivalent to Blind Fighting (p. B180) and functions similar to the Scanning Sense (Sonar) Advantage (B81). The user must be able to click their tongue or make a similar noise in some fashion. The type of noise is not actually important, but it must be short, controlled, and specifically trained with (in the real world, some have learned to use a bike bell, so they can ride a bike).

Each attempt requires a skill roll with a penalty based on time and noise level. Acute hearing adds directly to this roll. With no concentration time, the roll is at -8. One second is -4, two is -2, three or more is no penalty. These penalties are halved with the use of a louder sound (this cannot be produced by a normal tongue). The noise penalty is as per Blind Fighting. On a critical failure, the user makes some kind of huge mistake.