Australian National Tide Tables (AHP 11)


2019 Edition Now Available

The Australian National Tide Tables (ANTT, otherwise known as AHP11) contains information for over 80 Primary (Standard) ports and over 600 Secondary ports in Australia, Papua New Guinea, Solomon Islands, Antarctica and Timor-Leste. This information includes but is not limited to:

  • Predictions for high and low water for each day of the year for over 80 Standard Ports.
  • Predictions of maximum rates of tidal streams for Torres Strait and Port Phillip Heads.
  • Tidal Stream diagrams for Sydney, Broome and Darwin.
  • Tidal levels and time difference for all Secondary ports in relation to the relevant Standard Port.

The main 22 harmonic constituents for all Standard and Secondary Ports are available on request through our licensing process.


ANTT are official tide tables published by the AHO, Australia's national charting authority. ANTT allow:

  • Vessels navigating in Australia to meet SOLAS Chapter V regulations (and AMSA regulations1) covering the carriage of charts and publications. For further details visit the Australian Maritime Safety Authority (AMSA) website (
  • Commercial vessels 12 metres or more in length and engaged in Australian domestic operations, to meet the National Standards for Commercial Vessels (NSCV). For further details visit the National Marine Safety Committee (NMSC) website (
  • Recreational vessels to sail both inshore and offshore.

Note 1: See AMSA Marine Orders Part 21, Order 6 of 2010, which details carriage requirements for nautical charts and publications necessary for the intended voyage.


Sold As...

ANTT are published as a paper book. They are released annually in October and provide tidal predictions for the following calendar year.

The Australian Hydrographic Office also releases an electronic equivalent to ANTT which meets the same carriage requirements. For more information, see AusTides.


ANTT are updated via fortnightly Australian Notices to Mariners (NtM).

The relevant notices can be found on the Notices to Mariners section of this website or can be supplied automatically, via the eNotices email service.

Instructions on how to update ANTTs for NtM updates can be found in the Australian Chart & Publication Maintenance Handbook, also published by the AHO.


Please see our Pricing page for all AusENC Pricing.

Where to Buy

The ANTT can be purchased from your local Chart Distribution Agent.

The Australian Chart and Publication Maintenance Handbook, which provides instructions on how to update ANTT for Notices to Mariners updates, can also be purchased from your local agent.


What is a standard port?

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.

What is a secondary port?

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.

Where can I find more information about Tides?

Further information about tides including a tidal glossary can be found on the Tidal Information section of this website.

Tidal enquiries can be directed to:
Manager Tides and Geodetic


We value your feedback. The AHO is committed to continuous improvement of its products. If you are a user of the ANTTs and wish to provide feedback, please use our feedback form.


Additional Info

Predictions in ANTT for times and heights for high and low water are referenced to LAT, which is chart datum for most large scale charts covering ports. However, chart datum for some ports differs from LAT.

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.

For more information on vertical datums refer to section 13.12 in the Seafarers Handbook for Australian Waters.

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