A 30-year-old man from Plymstock has been arrested on suspicion of vehicle interference at Oreston.
Officers were called to Thorneyville Close at around 6am on Sunday, February 3 following a call from a member of the public.
They searched the area and arrested the man nearby.
They recovered a boxed sat nav system and are trying to find where it came from.
The suspect has been released on police bail until 180313
Anyone who thinks they may be missing such an item is asked to call the police on 101 quoting crime reference EK/13/88.