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• Maritime boundary downloads

  Download New Zealand’s maritime boundaries
  Guidance

  • Marine information

• Standard port periods of observation

  Find the period over which tidal observations were analysed to produce our tide predictions.
  Guidance

  • Marine information

• How to calculate tide times and heights

  How to calculate the times and heights of and between high and low waters.
  Guidance

  • Marine information

• Meteorological effects on tides

  Unusually high or low barometric pressure, or prolonged periods of strong winds, can mean the actual sea level is higher or lower than the predicted height.
  Guidance

  • Marine information

• Making sea level measurements

  Until quite recently the use of float gauges was the most common method of measuring and recording sea levels.
  Guidance

  • Marine information

• Exclusive Economic Zone & continental shelf boundaries between New Zealand & Australia

  New Zealand and Australia have rights over areas of ocean called their Exclusive Economic Zones (EEZ).
  Guidance

  • Marine information

• Tide prediction guidance

  Tidal levels for standard ports, information on reading tide predictions, and the standard port datum descriptions for New Zealand ports.
  Guidance

  • Marine information

• Hydrography

  Standards and specifications for carrying out hydrographic surveys for safety of navigation, and the benefits of hydrographic survey data.
  Guidance

  • Marine information

• Tide prediction formats

  Find out about tide prediction formats and how to interpret the values.
  Guidance

  • Marine information

• Standard port datum descriptions

  Find New Zealand's standard port chart datums. These are the datums used for stating the depths of the sea on nautical charts, including the level of the water at ports.
  Guidance

  • Marine information

• Tides around New Zealand

  New Zealand's tidal regime is semi-diurnal, so on most days two high and two low tides occur at any location.
  Guidance

  • Marine information

• Tides

  Learn about tidal theory and the different types of tides around New Zealand.
  Guidance

  • Marine information

• Marine scientific research

  Information on applications to undertake marine scientific research (MSR).
  Guidance

  • Marine information

• Marine geospatial information

  Data about the marine environment which helps us understand how to protect our biodiversity and ecosystems.
  Guidance

  • Marine information

• Cause and nature of tides

  Find out about what causes tides and how they vary depending on time and location.
  Guidance

  • Marine information

• About Notices to Mariners

  LINZ publishes Annual New Zealand Notices to Mariners and fortnightly New Zealand Notices to Mariners (NTMs).
  Guidance

  • Marine information

• Charts

  Learn about keeping your nautical charts up-to-date with our Notices to Mariners.
  Guidance

  • Marine information

• Finding and accessing MGI

  Finding and accessing data facilitates its reuse.
  Guidance

  • Marine information

• Customary interests

  Information for survey and spatial professionals who are preparing maps to support applications by iwi, hapu or whānau groups for recognition of customary interests under the Marine and Coastal Area (Takutai Moana) Act 2011.
  Guidance

  • Marine information
  • Māori and iwi
  • Survey

• Understanding hydrographic data

  Toitū Te Whenua LINZ collects hydrographic data for charting purposes using our hydrographic standards and technical specifications detailed in HYSPEC.
  Guidance

  • Marine information

• Maritime boundary definitions

  Find out more about New Zealand's maritime zones and boundaries.
  Guidance

  • Marine information

• Tides glossary

  Definitions of common tidal terms.
  Guidance

  • Marine information

• Analysis and prediction of tides

  The tide you see is a combination of all the different water movements happening at that location.
  Guidance

  • Marine information

• Hydrography standards and technical specifications

  Standards and specifications for hydrographic surveys and the production of nautical charts and publications, and links to International Hydrographic Organization (IHO) resources.
  Guidance

  • Marine information

• Applying corrections to charts and nautical publications

  You can keep your charts and nautical publications up to date using our Notices to Mariners.
  Guidance

  • Marine information

• Managing and reusing MGI

  A “collect once, use many times” approach can grow the value of marine geospatial data.
  Guidance

  • Marine information

• Standard port tidal levels

  Find the standard tidal levels for ports around New Zealand.
  Guidance

  • Marine information

• Maritime boundaries

  New Zealand has sovereign rights over a vast area of ocean, along with the fishery, mineral and petroleum resources that may exist in that area.
  Guidance

  • Marine information

• Printing Notices to Mariners

  How to print tracings and blocks in Notices to Mariners.
  Guidance

  • Marine information