The collection includes maps from the Whitehorse and Manningham area.
In the catalogue select the Maps tab and then type in a location and perhaps a date and see what items appear.
Maps can also be accessed via Trove - http://trove.nla.gov.au. In the maps section I typed the name Mackillop and located a copy of the sketch of the route taken by George Mackillop and his party when they explored part of north east Victoria in 1835.
Google Maps is an extremely useful tool for exploring where family members used, especially when street view is available for an area. When I have a full address for a home owned by an ancestor, particularly in England, I have successfully used this resource to locate where they lived and sometimes have been able to view the actual house.
When George Mackillop and his family returned to the UK in the 1840s they moved to Bath where they lived in a town house at 26 Grosvenor Place.
Using the navigation bar on the left and dragging the person image to the place indicated on the map an image of the house, now a medical surgery appears.
Actual photos of the Grosvenor Place property taken on a recent visit to Bath can be viewed in another post in this blog - http://connectingthefamily.blogspot.com.au/2012/05/notes-from-mc2-photos.html
If it is not possible to visit a location, online mapping services such as Google Maps are the next best thing.