A police spokesman said there was very little doubt that the service station would have been robbed had the camera monitor not seen what was happening.
In November last year the cameras recorded two men who, according to police, were showing every sign of intending to rob the service station. The monitor followed the pair, from camera to camera, and alerted a patrol before they reached the service station, which was believed to be their target.
The attendant was advised and locked the doors, and the patrol arrived before the two men tried to enter. One was allegedly seen to take a knife from the rear waistband of his trousers and put it in a bag.
By that stage the police, including a dog handler, had been called.
The two men walked off but were again followed by the camera monitor as they made their way south along the main street, and police apprehended them near the fire station.
One of them, a 24-year-old local, was charged with possession of a knife in a public place, possession of an imitation firearm (found in his bag), possession of a methamphetamine utensil and preparing to commit a crime.