Multiple realities
(covers information from several alternate timelines)

An impulse wake was a wake left by a starship's impulse engines.

In 2154, Enterprise's impulse wake destabilized a subspace corridor it was traversing, throwing the ship back in time 117 years to 2037. This led to the creation of an alternate timeline that was eventually erased. (ENT: "")

In 2369, Ah-Kel was able to locate the USS Ganges in the Chamra Vortex by locking onto its impulse wake. (DS9: "Vortex")

When the Delta Flyer crash landed on a planet in 2375, its impulse wake led the USS Voyager to its resting place in the planet's northern hemisphere. (VOY: "Once Upon a Time")

In a deleted scene from "Basics, Part II", Tom Paris says he plans to approach the Kazon-occupied Voyager by getting into the ship's impulse wake.
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