Notice to mariners

A Notice to Mariners (NtM) reports mariner safety matters on Northern Territory (NT) waters.

These matters include:

  • new hydrographic information
  • changes in channel depths
  • aids to navigation.

They're shared to mariners (recreational and commercial) and maritime-related organisations.

Marine operators are also required by law to report navigational hazards or dangers.

Types of notices

A notice can appear as a:

  • permanent notice - changes to information which result in a chart correction released by the Australian Hydrographic Service
  • preliminary notice (P) - a pre-emptive notification of a permanent change
  • temporary notice (T) - information valid only for a limited time.

Find notices below. They may also be published in local and state-wide print media and reproduced in the Australian Notices.

Port of Darwin local notices

NtM number and name Date published Notice type
Local NtM 2022 - 025 Environmental Survey PDF (612.1 KB) 25 May 2022 Temporary
Local NtM 2022-016 B03 beacon temporary light fitted PDF (647.7 KB) 29 Mar 2022 Temporary
Local NtM 2022-012 Declared port depths (corrected) PDF (536.2 KB) 14 Mar 2022 Permanent
NtM 2022-0002-BO7 Beacon light reinstated PDF (443.3 KB) 15 Jan 2022 Temporary
2020-069 Additional information regarding NtM2020-063 PDF (551.6 KB) 23 Oct 2020 Temporary
2020-063 HMAS Coonawarra redevelopment program closed waters until 30 June 2023 PDF (983.4 KB) 06 Oct 2020 Preliminary
2019-021 Scientific instrument buoys PDF (632.0 KB) 27 Mar 2019 Temporary

NT coastal notices - whole of NT waters

NtM number and name Date published Notice type
NtM 2022-006 - Deployment of small wave buoy near Goodrich Bank.pdf PDF (435.5 KB) 06 May 2022 Temporary
Coastal NtM 2022-004 Lobster seed collection platforms PDF (700.8 KB) 07 Apr 2022 Permanent
NtM 2021-009 Wave and temperature buoy PDF (666.0 KB) 14 Sep 2021 Temporary
NtM 2020-001 Ghost net reported sighting PDF (371.9 KB) 02 Jun 2020 Temporary
NtM 2019-006 Buffalo Creek beacons PDF (554.7 KB) 20 Jun 2019 Permanent
NtM 2019-002 Medina Inlet ATONs PDF (553.2 KB) 27 Mar 2019 Permanent
NtM 2018-003 Dundee FAD deployment PDF (506.6 KB) 07 Sep 2018 Temporary


If you would like to be added to the email distribution list, email

For more information, contact the regional harbourmaster.

Last updated: 20 September 2021

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