Canada DNC 28
The Northwestern Passages · HYDROARC 288/17
What this record establishes
Archived notice · 2019-04-05 11:14Z
This notice comes from the historical archive. Its archived status does not establish when or how the reported situation ended.
- Source and dates
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · NAVAREA XVIII 100/17 210849Z SEP 17.. Issued 2017-09-21 08:50Z. First collected 2026-08-17 13:38Z; last seen in collection 2026-08-17 15:46Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- The Northwestern Passages. The parsed report position is 68.461, -113.389. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Current notices and reporting history in the The Northwestern Passages →
- issued
- 2017-09-21 08:50Z
- status
- Archived notice
- authority
- NAVAREA XVIII 100/17 210849Z SEP 17.
- NAVAREA
- NAVAREA XVIII · named as the source of this relay
- sea
- The Northwestern Passages
- position
- 68.461, -113.389
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
CORONATION GULF. CANADA DNC 28. CHART 15955. SUB-SURFACE SCIENTIFIC MOORING, TOP FLOAT 40 METERS, ESTABLISHED IN 68-27.65N 113-23.33W.
Reading this warning
- DNC (Digital Nautical Chart)
- A reference to one of the regions of NGA's Digital Nautical Chart, used to tell the reader which charts a warning affects.
- Chart reference
- The number of the nautical chart on which the reported position lies.
- Scientific mooring
- Instruments anchored to the seabed and held up by floats, sometimes just below the surface, left for months to measure the ocean.
- Position (degrees and minutes)
- How warnings write positions: degrees, a hyphen, then minutes, with N/S and E/W — 49-40.8N 003-43.8W.
Collected reports in this area · survey operations
7 within 180 nm since 2010 · 0 in the last 12 months · 0 listed in force now
Counts include repeat notices about the same situation. NGA archive coverage ends 2024-05; live collection began 2026-08-17. The period between them is incomplete. An empty year is not evidence that no hazards occurred.
- Scientific mooring, top float seven meters above sea floor, established in 68-55.92N 105-49.71W2022-08-22
- Scientific mooring, top float 15 meters below surface, established in: a. 67-40.09N 107-57.28W2022-08-21
- Scientific mooring, top float 15 meters below surface, established in 68-20.75N 112-21.12W2022-08-19
- Scientific mooring, top float 15 meters below surface, established in 67-53.89N 111-21.21W2022-08-19
- Scientific mooring, top float 37 meters, established in 70-42.59N 117-51.21W2021-10-07
- Salvage operations in progress until further notice in 67-58.27N 112-40.34W2010-09-12
Month of issue in the collected archive
All available years combined. Uneven collection and repeat bulletins affect these counts; this chart does not measure the seasonality or probability of incidents.
Nearby notices listed in force · within 120 nm
No other collected notice is currently listed in force within this radius. This does not establish safe conditions.
Worldwide in the collected sources
50 survey operations listed in force · see all
Record snapshot 2026-09-24 23:11Z; source collection times vary.
Surveys
Hydrographic and scientific survey vessels, often towing long arrays. All current survey operations →
Not for navigation. This is a re-rendering of an official navigational warning for awareness; mariners must use official NAVAREA broadcasts and their national MSI service.