Australian National Tide Tables (AHP11)

OVERVIEW


Australian National Tide Tables (ANTT) contains information for over 90 Primary (Standard)1 and 700 Secondary2 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.

(The main 22 harmonic constituents for all Standard and Secondary Ports may be found within AusTides)

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OFFICIAL NAUTICAL PUBLICATION

Australian National Tide Tables are official nautical publications. Official nautical publications are those issued by, or on the authority of, a Government authorised Hydrographic Office or other relevant government institution. The Australian Hydrographic Office (AHO) is Australia’s national charting authority and publishes official nautical publications of the Australian Charting Area.

For details about carriage requirements of nautical products in Australian waters for SOLAS and NSCV regulated vessels, visit the Australian Maritime Safety Authority (AMSA) website (www.amsa.gov.au) and refer to Marine Orders and Marine Notices.

Download

ANTT are released annually and provide tidal predictions for the calendar year.

The AHO has ceased printing paper books. The ANTT are now published as a PDF book, which may be downloaded from our Product Downloads page.

The PDF book is an official nautical publication and complies with Australian carriage requirements.

From 2024, ANTT tidal information will also be available via an interactive web service on the AHO website. This platform will provide an enhanced user experience by giving access to tidal information in an intuitive and functional way, via a searchable map allowing specific port discovery with the ability to view and download individual port tidal data.

UPDATES

Updated information is included in ANTT as it is received and verified. Any updates will be published via Australian Notices to Mariners.

ANTT users should subscribe to eNotices to be notified by email when new updates are available to download, or monitor Australian Notices to Mariners.

Instructions on how to update printed copies are included in the Australian Chart and Publication Maintenance Handbook.

ADDITIONAL INFORMATION

    1. A Standard Port (also referred to as a 'Primary Port') is a place for which independent daily tidal predictions are given in the tidal height or tidal stream tables. Predictions are typically based on observations over several decades.
    2. A Secondary Port is a place for which tidal predictions given the tidal height or tidal stream tables are calculated by applying relevant corrections to the tidal predictions of a standard port. Predications maybe based upon lesser periods of continuous observations.
    3. Predictions in ANTT for times and heights for high and low water are referenced to Lowest Astronomical Tide (LAT), which is chart datum for most large scale Electronic Navigational Charts (ENC) and paper nautical charts covering ports. However, chart datum for some ports differs from LAT.
    4. While short term predictions for Australian Standard Ports are also available from the Australian Bureau of Meteorology (BoM), it should be noted that the latter do not take into account differences between chart and tidal datums. Predictions for Secondary Ports are not available through the BoM website.
    5. For more information on vertical datums refer to section 12.9 in The Mariner's Handbook for Australian Waters.