Psi Sense and Passive Abilities

[Daigoro]

It says, "whenever anyone near you uses [psi]," which makes no reference to that use being active or passive.

I believe the designation of being active or passive is important for GURPS game mechanics in terms of what counts as a maneuvre, how many actions a character gets and so on. I would be leery of reading that as having a wider, more general, in-universe meaning.