Nav-Scram
A nav-scram module projects a burst of subatomic particles to interfere with and overload navigational equipment. During the next round’s helm phase, the pilot of a starship affected by a nav-scram must roll their Piloting check twice and take the worse result when determining the order in which starships move during that round. A heavy or capital nav-scram module instead causes the affected starship’s pilot to roll Piloting checks twice and take the lower results during the next round. A capital nav-scram module’s effects last 1d3 rounds.
Source
Starship Operations Manual pg. 15