Impulse wake

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.''

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

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.