Spatial displacement was a travel technology of the Voth. It allowed the ship to simply move, as if transported, to another area of space, which might be up to ninety light years away.
It was distinct from their transwarp (as well as their transporter) technology, and might even be used while in transwarp.
As it could move ships and people slightly out of phase with our space-time continuum, it doubled as a highly advanced cloaking device
Their personal spatial displacement system could be disrupted by altering a phaser to a dispersion frequency of approximately 1.85 GHz.
A spatial displacement was detected in 2373 by the USS Voyager, anouncing the appearance of a Voth city ship at their location. (VOY: "Distant Origin")