Australian National Tide Tables


AHP11 Australian National Tide Tables (ANTT) contains information for over 80 Primary (Standard)1and 600 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, and are available upon request by email to

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It is expected that all commercial vessels operating in Australian waters carry and refer to either AusTides or Australian National Tide Tables. Vessels operating internationally mat chose to carry Admiralty Tide Tables or Admiralty TotalTides, but should note that some minor differences in the times of predictions may occur using Admiralty products.


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 monitor Australian Notices to Mariners for notification of updates, or subscribe to eNotices.


ANTT are published as a printed publication which may be purchased from AHO chart distribution agents. They are released annually in October for the following year.


    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 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 later 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 13.12 in AHP20 Mariner's Handbook for Australian Waters.