She told the court that she visited a variety of locations in relation to the case between January 7 and January 14.
Sean Guerin BL, for the prosecution, asked her: "Having visited these various locations you have been able to prepare a number of maps to assist the court and the jury in this case?"
Garda Bulger: "That's correct."
The maps she had drawn up included small scale ones as well as large scale ones and had featured various shaded areas as well as various routes, the court heard.
The jurors, who all had access to the maps, were then taken step-by-step through what the various maps showed with Garda Bulger replying to confirm their contents.
These maps, the jury learned, showed the locations of the O'Donoghue and Holohan family homes in Ballyedmond Hill and also showed the road from the area to Midleton. They included Midleton town centre, showing features including a Mace shop, the Midleton GAA club, a service station, McDonalds and the Supervalu supermarket.
Another map was of the south coast of Cork, showing Inch Strand, Ballintra East and a junction where four roads meet.
Another map showed the various locations of telecommunications masts for Vodafone mobile phones, the jury was told.
Garda Bulger then left the witness box to be replaced by Detective Sergeant Brian Goulding.
Under examination from Mr Guerin BL, Det Sgt Goulding confirmed the contents of six separate volumes of photographs.
The first volume contained 22 pictures and were of the Holohans' home and O'Donoghues' family house.
Interior shots of the O'Donoghue home included the kitchen, bathroom, the accused's bedroom and the shed where a petrol can was standing.
A second volume included features like the site of Foley's service station, and the CCTV cameras.
A third and fourth volume showed the place where the body was found.
A fifth was a series of aerial photographs and a sixth volume included pictures of plastic bags found at the scene where the body was discovered.