Australian National Tide Tables (ANTT) contains information for more than 90 Primary (Standard) and 700 Secondary ports in Australia, Papua New Guinea, Solomon Islands, Antarctica and Timor-Leste. This information includes:
- Predictions for high and low water for each day of the year for all Standard ports.
- Tidal level and time differences for all Secondary ports.
- Instructions and forms for calculating intermediate times and heights.
- Effects of wind and barometric pressure on tide, particularly at certain ports.
- Details of transmitting tide gauges in Torres Strait.
- Predictions of maximum rates of tidal-streams for Torres Strait and Port Phillip Heads.
- Tidal-stream diagrams for Sydney, Broome and Darwin.
Corrections and amendments affecting the ANTT are published via Australian Notices to Mariners. When maintaining a printed copy, apply all relevant notices issued since publication:
- 2026: No notices issued
The PDF publication available below and the tidal information provided through the ANTT Web Service incorporate all listed Notices to Mariners updates.
Web Service
The ANTT tidal information is also available as an interactive web service. This platform provides an enhanced user experience, giving access to tidal information in an intuitive and functional way. It utilises a searchable map allowing specific port discovery with the ability to view and download individual port tidal data.
ANTT 2026 Web Service ANTT 2027 Web Service
Supporting information
Tide predictions
The Australian Bureau of Meteorology (BoM) provides short-term tidal predictions for Australian Standard ports. These predictions do not account for differences between chart datum and tidal datum. Predictions for Secondary ports are not available through the BoM website.
Vertical datums
For more information on vertical datums refer to the Mariner's Handbook for Australian Waters (AHP20).
Harmonic constituents
The 22 principal harmonic constituents for Standard and Secondary ports are available through the AusTides application.
Official nautical publication
The ANTT is an official nautical publication issued by the Australian Hydrographic Office (AHO), Australia’s national charting authority. The PDF complies with Australian carriage requirements.
For carriage requirements applying to SOLAS and NSCV-regulated vessels, refer to the relevant Marine Orders and Marine Notices on the Australian Maritime Safety Authority (AMSA) website.
For more information or to provide feedback, email AHO Communications.