The Surveyor-General Victoria (SGV) Geodetic Survey section is responsible for managing Victoria's geodetic and positioning infrastructure. This is the infrastructure that enables users to determine positions and heights in relation to the nationally adopted Geocentric Datum of Australia (GDA2020 or GDA94) and Australian Height Datum (AHD). Accurate and reliable access to position and height reference systems – global and regional – supports a wide range of spatial applications, such as mapping, navigation, surveying and major construction projects.

Victoria's geodetic infrastructure is comprised of:

  • Vicmap Position-GPSnet Global Navigation Satellite System (GNSS) Continuously Operating Reference Station (CORS) network
  • a network of survey control marks
  • authoritative information on survey control marks stored in the Survey Marks Enquiry Service database
  • a large archive of survey measurements to Victoria's survey control mark network
  • automated systems for the processing, analysis and delivery of survey control mark coordinates.


Our vision for geodesy in Victoria is to provide accurate and reliable positioning, now and in the future.

Strategy for Victoria's positioning system 2016 - 2020

This strategy documents the path to maintain and enhance Victoria's geodetic infrastructure so that the public, commercial, academic and scientific sectors have access to accurate and reliable positioning.

Strategy for Victoria's positioning system 2016 - 2020 (PDF, 5.0 MB)

Geocentric Datum of Australia

The Geocentric Datum of Australia 2020 (GDA2020) and the Map Grid of Australia 2020 (MGA2020) are now the official datum and map projection for Australia. GDA2020 is a conventional static datum based on ITRF2014 at the reference epoch of 1 January 2020. Surveyor-General Victoria (SGV) has led the implementation of GDA2020 in Victoria and is actively encouraging and supporting organisations in the transition of their spatial data and applications to the new national datum.

The Geocentric Datum of Australia 1994 (GDA94) and Map Grid of Australia 1994 (MGA94) is still maintained in Victoria. GDA94 is a static coordinate datum based on the International Terrestrial Reference Frame 1992 (ITRF92), held at the reference epoch of 1 January 1994.

The coordinates of features on maps based on GDA94 are no longer aligned with Global Navigation Satellite System (GNSS), such as GPS. Therefore, users are encouraged to transition to GDA2020. Differences of this magnitude become significant when it comes to applications that rely on accurate satellite positioning such as intelligent transport, precision agriculture and surveying.

Vicmap Position - GPSnet

Vicmap Position - GPSnet is a positioning and navigation correction service available for GNSS users throughout Victoria. SGV maintains an integrated network of GNSS Continuously Operating Reference Stations (CORS) that facilitate the GPSnet service. This infrastructure supports consistent, homogenous and reliable satellite positioning and navigation anywhere in Victoria.

Visit the GPSnet website

Page last updated: 09/06/20