These are external services to help define the longitude and latitude of a location. (Read explanation of geographic co-ordinates.)

Australasian locations:

• Australian Placenames Search (Gazetteer of Australia)
  • Enter an Australian place name, receive a list of matching localities. Select one, get a detailed map showing your location, together with a list of details. Interactive maps lead on to available topographic data.
  • Service at Geoscience Australia (formerly AUSLIG)
• Australian Antarctic Gazetteer
  • Enter an Antarctic place name, get a list of matching names with details (latitude, longitude, locality image, etc.)
  • Service at Australian Antarctic Data Centre (AADC)
• Australian Postcode Search
  • Search for postcodes and post office locations
  • Service at Australia Post
• References for defining Australian locations, geospatial regions, and geographic place names
  • List of useful online services and documents
• Find which catchment
  • Enter a point location, receive a list of Australian "Drainage Divisions and Major River Basins" in which your location resides
  • Optionally plot the location on a locality map
• New Zealand Geographic Place-Names Database
  • Enter a place name or geographic coordinates with a distance radius
  • Service at Land Information New Zealand (LINZ)
• NZ Topgraphic 1:50,000 Map Index (260 series)
  • discover the names of specific map sheets
• NZ Topgraphic 1:250,000 Map Index (262 series)
  • discover the names of specific map sheets
• Earth View
  • Look at Goulburn NSW Australia
• Xerox Parc Map Viewer
• Look at Goulburn NSW Australia

World-wide locations:

• Getty Thesaurus of Geographic Names
• Alexandria Digital Library Gazetteer Server
• How far is it
  • Gazetteer, mostly US names, some world cities. Look up a location. Also shows distance between two locations

Other useful services:

• Convert between degree-minutes-seconds and decimal degrees
• GeoTags location-based search engine - clickable zoomable world map to get approximate coordinates