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Navigational Warnings (NAVWARNs) replace Notices to Shipping (NOTSHIPs) and shall be construed as Notices to Shipping
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Showing results 1 to 20, from 20 total results.
Showing results 1 to 20, from 20 total results.
Areas affected by the message
Aids to Navigation - Lake Simcoe, Trent-Severn Waterway - Lake Couchiching
2026-05-15 20:30 UTC
NW-C-1534-26

Missing

Aids: The Narrows green spar buoy S311
Cancels NW-C-1514-26
Areas affected by the message
Lock Closed - Georgian Bay, Lake Simcoe, Trent-Severn Waterway - Severn River
2026-05-15 19:11 UTC
NW-C-1530-26

Trent-Severn Waterway locks 42, 43, 44 and 45 are closed to navigation due to high water flows.

Areas affected by the message
Aids to Navigation - Trent-Severn Waterway - Sparrow Lake
2026-05-15 18:47 UTC
NW-C-1529-26

Missing

Aids: Sparrow Lake Chute red spar buoy S187
Areas affected by the message
Aids to Navigation - Trent-Severn Waterway - Campbellford
2026-05-15 15:48 UTC
NW-C-1520-26

Off station

Aids: Lock 14 south entrance red spar buoy T252
Areas affected by the message
Aids to Navigation - Trent-Severn Waterway - Frankford
2026-05-15 15:48 UTC
NW-C-1519-26

Off station

Aids: Lock 5 green spar buoy T29
Areas affected by the message
Aids to Navigation - Lake Simcoe, Trent-Severn Waterway - Friday Harbour
2026-05-15 15:48 UTC
NW-C-1518-26

Light Unlit

Aids: Big Bay Point light LL 1369
Areas affected by the message
Aids to Navigation - Lake Simcoe, Trent-Severn Waterway - Innisfil
2026-05-15 15:48 UTC
NW-C-1517-26

Unlit

Aids: Cook's Bay Shoal light buoy SS16 LL 1364
Areas affected by the message
Aids to Navigation - Lake Simcoe, Trent-Severn Waterway - Champlain Point
2026-05-13 18:26 UTC
NW-C-1434-26

Missing

Aids: Grape Island light buoy ST LL 1369.4
Areas affected by the message
Aids to Navigation - Lake Simcoe, Trent-Severn Waterway - Keswick
2026-05-12 14:30 UTC
NW-C-1396-26

Orange buoy temporarily established at 44 13.927N 079 28.326W to mark Keswick water treatment facility manhole. 

Areas affected by the message
Aids to Navigation - Georgian Bay, Trent-Severn Waterway - Port Severn
2026-05-08 13:03 UTC
NW-C-1326-26

All spar buoys in the Port Severn area between lock 45 and the 400 highway bridge unreliable due to strong water flows.

Areas affected by the message
Obstruction - Lake Simcoe, Trent-Severn Waterway - Barrie
2026-05-07 13:45 UTC
NW-C-1296-26

Subsurface scientific equipment placed 3 metres below the surface at 44 23.897N 079 34.222W and 44 23.902N 079 34.190W

Areas affected by the message
Seasonal Buoy Program - Great Lakes - Great Lakes
2026-04-13 12:35 UTC
NW-C-0830-26

The seasonal recommissioning of Canadian Coast Guard navigational buoys is underway in the Great Lakes sector.

Mariners requiring additional information are requested to contact the appropriate MCTS Centre, Navigational Warning Issuing Desk, or visit the Canadian Coast Guard Website at the following address: https://e-navigation.canada.ca

Areas affected by the message
Obstruction - Lake Simcoe, Trent-Severn Waterway - Barrie
2025-11-17 14:56 UTC
NW-C-3545-25

Subsurface scientific mooring temporarily established at:

44 23.890N 079 34.297W
44 23.880N 079 34.327W, 3 metres below the surface.

44 23.928N 079 34.277W
44 23.925N 079 34.308W, 8 metres below the surface.

Areas affected by the message
Aids to Navigation - Great Lakes, Lake Nipissing - West Arm
2025-10-14 21:07 UTC
NW-C-3177-25

Privately maintained navigational aids may be unreliable due to multiple buoys reported having discrepancies.

Areas affected by the message
Aids to Navigation - Lake Simcoe, Trent-Severn Waterway - Trout Shoal
2025-07-19 16:29 UTC
NW-C-2180-25

Off position, 400 metres west

Aids: Trout Shoal light buoy S323 LL 1371
Areas affected by the message
Aids to Navigation - Trent-Severn Waterway - Fenelon Falls
2025-06-13 17:38 UTC
NW-C-1622-25

Green spar buoy N21 temporarily established in 44 32.276N 078 44.658W. 

Areas affected by the message
Aids to Navigation - Trent-Severn Waterway - Fenelon Falls
2025-06-13 17:36 UTC
NW-C-1621-25

Temporarily removed. 

Aids: Fenelon River port daybeacon N21
Areas affected by the message
Obstruction - Lake Simcoe, Trent-Severn Waterway - Atherly
2025-06-05 17:32 UTC
NW-C-1499-25

Subsurface scientific equipment placed 3 metres below the surface at 44 36.257N 079 22.179W

Areas affected by the message
Aids to Navigation - Georgian Bay, Trent-Severn Waterway - Calf Island
2025-05-17 13:17 UTC
NW-C-1158-25

Green spar buoy temporarily established in 44 48.668N 079 43.196W. 

Areas affected by the message
Aids to Navigation - Lake Simcoe, Trent-Severn Waterway - McRae Point
2025-04-28 18:05 UTC
NW-C-0781-25

Missing

Aids: Goffatt Island light buoy STA LL 1369.8
Showing results 1 to 20, from 20 total results.
Showing results 1 to 20, from 20 total results.
Details
Showing results 1 to 20, from 20 total results.
Showing results 1 to 20, from 20 total results.
ID Date Title Areas Charts Description
NW-C-1534-26
Areas affected by the message
44° 36.413'N 079° 22.177'W
2026-05-15 20:30 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - Lake Couchiching 2028(NAD83)

Missing

Aids: The Narrows green spar buoy S311
Cancels NW-C-1514-26
NW-C-1530-26
Areas affected by the message
44° 46.194'N 079° 21.022'W (Lock 42)
44° 51.458'N 079° 32.402'W (Lock 43)
44° 53.061'N 079° 40.501'W (Lock 44 - Big Chute)
44° 48.232'N 079° 43.231'W (Lock 45)
2026-05-15 19:11 UTC Lock Closed Georgian Bay, Lake Simcoe, Trent-Severn Waterway - Severn River 2029(NAD83), 2029(NAD83)

Trent-Severn Waterway locks 42, 43, 44 and 45 are closed to navigation due to high water flows.
NW-C-1529-26
Areas affected by the message
44° 50.320'N 079° 27.305'W
2026-05-15 18:47 UTC Aids to Navigation Trent-Severn Waterway - Sparrow Lake 2029(NAD83)

Missing

Aids: Sparrow Lake Chute red spar buoy S187
NW-C-1520-26
Areas affected by the message
44° 20.049'N 077° 46.375'W
2026-05-15 15:48 UTC Aids to Navigation Trent-Severn Waterway - Campbellford 2021(NAD83), 2022(NAD83)

Off station

Aids: Lock 14 south entrance red spar buoy T252
NW-C-1519-26
Areas affected by the message
44° 10.937'N 077° 35.435'W
2026-05-15 15:48 UTC Aids to Navigation Trent-Severn Waterway - Frankford 2021(NAD83)

Off station

Aids: Lock 5 green spar buoy T29
NW-C-1518-26
Areas affected by the message
44° 24.284'N 079° 30.660'W
2026-05-15 15:48 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - Friday Harbour 2028(NAD83)

Light Unlit

Aids: Big Bay Point light LL 1369
NW-C-1517-26
Areas affected by the message
44° 17.438'N 079° 30.918'W
2026-05-15 15:48 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - Innisfil 2028(NAD83)

Unlit

Aids: Cook's Bay Shoal light buoy SS16 LL 1364
NW-C-1434-26
Areas affected by the message
44° 35.104'N 079° 22.489'W
2026-05-13 18:26 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - Champlain Point 2028(NAD83)

Missing

Aids: Grape Island light buoy ST LL 1369.4
NW-C-1396-26
Areas affected by the message
44° 13.927'N 079° 28.326'W
2026-05-12 14:30 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - Keswick 2028(NAD83)

Orange buoy temporarily established at 44 13.927N 079 28.326W to mark Keswick water treatment facility manhole. 
NW-C-1326-26
Areas affected by the message
44° 48.096'N 079° 43.247'W
Pt 1: 44° 48.220'N 079° 43.362'W
Pt 2: 44° 47.992'N 079° 43.378'W
Pt 3: 44° 47.966'N 079° 43.123'W
Pt 4: 44° 48.213'N 079° 43.131'W
2026-05-08 13:03 UTC Aids to Navigation Georgian Bay, Trent-Severn Waterway - Port Severn 2029(NAD83)

All spar buoys in the Port Severn area between lock 45 and the 400 highway bridge unreliable due to strong water flows.
NW-C-1296-26
Areas affected by the message
44° 23.897'N 079° 34.222'W
44° 23.902'N 079° 34.190'W
2026-05-07 13:45 UTC Obstruction Lake Simcoe, Trent-Severn Waterway - Barrie 2028(NAD83)

Subsurface scientific equipment placed 3 metres below the surface at 44 23.897N 079 34.222W and 44 23.902N 079 34.190W
NW-C-0830-26
Areas affected by the message
45° 41.373'N 082° 27.639'W
Pt 1: 42° 04.465'N 084° 07.909'W
Pt 2: 45° 12.954'N 084° 30.256'W
Pt 3: 46° 49.564'N 089° 13.083'W
Pt 4: 47° 52.473'N 090° 36.148'W
Pt 5: 51° 04.260'N 089° 35.136'W
Pt 6: 50° 44.796'N 087° 14.430'W
Pt 7: 47° 14.637'N 082° 15.052'W
Pt 8: 47° 15.398'N 081° 08.961'W
Pt 9: 47° 47.004'N 079° 28.765'W
Pt 10: 47° 13.991'N 079° 02.076'W
Pt 11: 45° 51.776'N 074° 58.456'W
Pt 12: 45° 09.359'N 073° 41.831'W
Pt 13: 43° 53.154'N 074° 55.752'W
Pt 14: 42° 48.575'N 076° 12.614'W
Pt 15: 41° 13.528'N 081° 00.302'W
Pt 16: 40° 43.660'N 082° 04.392'W
Pt 17: 40° 40.664'N 082° 42.095'W
Pt 18: 40° 57.314'N 083° 29.506'W
Pt 19: 41° 09.129'N 083° 46.058'W
Pt 20: 41° 25.795'N 083° 57.714'W
2026-04-13 12:35 UTC Seasonal Buoy Program Great Lakes - Great Lakes 2400(NAD83)

The seasonal recommissioning of Canadian Coast Guard navigational buoys is underway in the Great Lakes sector.

Mariners requiring additional information are requested to contact the appropriate MCTS Centre, Navigational Warning Issuing Desk, or visit the Canadian Coast Guard Website at the following address: https://e-navigation.canada.ca
NW-C-3545-25
Areas affected by the message
Polyline
Pt 1: 44° 23.890'N 079° 34.297'W
Pt 2: 44° 23.880'N 079° 34.327'W
Polyline
Pt 1: 44° 23.928'N 079° 34.277'W
Pt 2: 44° 23.925'N 079° 34.308'W
2025-11-17 14:56 UTC Obstruction Lake Simcoe, Trent-Severn Waterway - Barrie 2028(NAD83)

Subsurface scientific mooring temporarily established at:

44 23.890N 079 34.297W
44 23.880N 079 34.327W, 3 metres below the surface.

44 23.928N 079 34.277W
44 23.925N 079 34.308W, 8 metres below the surface.
NW-C-3177-25
Areas affected by the message
46° 14.924'N 080° 23.813'W
Pt 1: 46° 16.296'N 080° 28.489'W
Pt 2: 46° 16.346'N 080° 19.268'W
Pt 3: 46° 13.442'N 080° 19.250'W
Pt 4: 46° 13.615'N 080° 28.489'W
2025-10-14 21:07 UTC Aids to Navigation Great Lakes, Lake Nipissing - West Arm 6038(NAD83)

Privately maintained navigational aids may be unreliable due to multiple buoys reported having discrepancies.
NW-C-2180-25
Areas affected by the message
44° 32.423'N 079° 21.108'W (Advertised position)
44° 32.412'N 079° 20.786'W (Reported position)
2025-07-19 16:29 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - Trout Shoal 2028(NAD83)

Off position, 400 metres west

Aids: Trout Shoal light buoy S323 LL 1371
NW-C-1622-25
Areas affected by the message
44° 32.276'N 078° 44.658'W
2025-06-13 17:38 UTC Aids to Navigation Trent-Severn Waterway - Fenelon Falls 2025(NAD83), 2025(NAD83)

Green spar buoy N21 temporarily established in 44 32.276N 078 44.658W. 
NW-C-1621-25
Areas affected by the message
44° 32.276'N 078° 44.659'W
2025-06-13 17:36 UTC Aids to Navigation Trent-Severn Waterway - Fenelon Falls 2025(NAD83), 2025(NAD83)

Temporarily removed. 

Aids: Fenelon River port daybeacon N21
NW-C-1499-25
Areas affected by the message
44° 36.257'N 079° 22.179'W
2025-06-05 17:32 UTC Obstruction Lake Simcoe, Trent-Severn Waterway - Atherly 2028(NAD83)

Subsurface scientific equipment placed 3 metres below the surface at 44 36.257N 079 22.179W
NW-C-1158-25
Areas affected by the message
44° 48.668'N 079° 43.196'W
2025-05-17 13:17 UTC Aids to Navigation Georgian Bay, Trent-Severn Waterway - Calf Island 2029(NAD83)

Green spar buoy temporarily established in 44 48.668N 079 43.196W. 
NW-C-0781-25
Areas affected by the message
44° 33.937'N 079° 21.955'W
2025-04-28 18:05 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - McRae Point 2028(NAD83)

Missing

Aids: Goffatt Island light buoy STA LL 1369.8
Showing results 1 to 20, from 20 total results.
Showing results 1 to 20, from 20 total results.
Table
Showing results 1 to 20, from 20 total results.
Showing results 1 to 20, from 20 total results.
ID Date Title Areas Charts Description
NW-C-1534-26 2026-05-15 20:30 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - Lake Couchiching 2028(NAD83)

Missing

Aids: The Narrows green spar buoy S311
Cancels NW-C-1514-26
NW-C-1530-26 2026-05-15 19:11 UTC Lock Closed Georgian Bay, Lake Simcoe, Trent-Severn Waterway - Severn River 2029(NAD83), 2029(NAD83)

Trent-Severn Waterway locks 42, 43, 44 and 45 are closed to navigation due to high water flows.
NW-C-1529-26 2026-05-15 18:47 UTC Aids to Navigation Trent-Severn Waterway - Sparrow Lake 2029(NAD83)

Missing

Aids: Sparrow Lake Chute red spar buoy S187
NW-C-1520-26 2026-05-15 15:48 UTC Aids to Navigation Trent-Severn Waterway - Campbellford 2021(NAD83), 2022(NAD83)

Off station

Aids: Lock 14 south entrance red spar buoy T252
NW-C-1519-26 2026-05-15 15:48 UTC Aids to Navigation Trent-Severn Waterway - Frankford 2021(NAD83)

Off station

Aids: Lock 5 green spar buoy T29
NW-C-1518-26 2026-05-15 15:48 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - Friday Harbour 2028(NAD83)

Light Unlit

Aids: Big Bay Point light LL 1369
NW-C-1517-26 2026-05-15 15:48 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - Innisfil 2028(NAD83)

Unlit

Aids: Cook's Bay Shoal light buoy SS16 LL 1364
NW-C-1434-26 2026-05-13 18:26 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - Champlain Point 2028(NAD83)

Missing

Aids: Grape Island light buoy ST LL 1369.4
NW-C-1396-26 2026-05-12 14:30 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - Keswick 2028(NAD83)

Orange buoy temporarily established at 44 13.927N 079 28.326W to mark Keswick water treatment facility manhole. 
NW-C-1326-26 2026-05-08 13:03 UTC Aids to Navigation Georgian Bay, Trent-Severn Waterway - Port Severn 2029(NAD83)

All spar buoys in the Port Severn area between lock 45 and the 400 highway bridge unreliable due to strong water flows.
NW-C-1296-26 2026-05-07 13:45 UTC Obstruction Lake Simcoe, Trent-Severn Waterway - Barrie 2028(NAD83)

Subsurface scientific equipment placed 3 metres below the surface at 44 23.897N 079 34.222W and 44 23.902N 079 34.190W
NW-C-0830-26 2026-04-13 12:35 UTC Seasonal Buoy Program Great Lakes - Great Lakes 2400(NAD83)

The seasonal recommissioning of Canadian Coast Guard navigational buoys is underway in the Great Lakes sector.

Mariners requiring additional information are requested to contact the appropriate MCTS Centre, Navigational Warning Issuing Desk, or visit the Canadian Coast Guard Website at the following address: https://e-navigation.canada.ca
NW-C-3545-25 2025-11-17 14:56 UTC Obstruction Lake Simcoe, Trent-Severn Waterway - Barrie 2028(NAD83)

Subsurface scientific mooring temporarily established at:

44 23.890N 079 34.297W
44 23.880N 079 34.327W, 3 metres below the surface.

44 23.928N 079 34.277W
44 23.925N 079 34.308W, 8 metres below the surface.
NW-C-3177-25 2025-10-14 21:07 UTC Aids to Navigation Great Lakes, Lake Nipissing - West Arm 6038(NAD83)

Privately maintained navigational aids may be unreliable due to multiple buoys reported having discrepancies.
NW-C-2180-25 2025-07-19 16:29 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - Trout Shoal 2028(NAD83)

Off position, 400 metres west

Aids: Trout Shoal light buoy S323 LL 1371
NW-C-1622-25 2025-06-13 17:38 UTC Aids to Navigation Trent-Severn Waterway - Fenelon Falls 2025(NAD83), 2025(NAD83)

Green spar buoy N21 temporarily established in 44 32.276N 078 44.658W. 
NW-C-1621-25 2025-06-13 17:36 UTC Aids to Navigation Trent-Severn Waterway - Fenelon Falls 2025(NAD83), 2025(NAD83)

Temporarily removed. 

Aids: Fenelon River port daybeacon N21
NW-C-1499-25 2025-06-05 17:32 UTC Obstruction Lake Simcoe, Trent-Severn Waterway - Atherly 2028(NAD83)

Subsurface scientific equipment placed 3 metres below the surface at 44 36.257N 079 22.179W
NW-C-1158-25 2025-05-17 13:17 UTC Aids to Navigation Georgian Bay, Trent-Severn Waterway - Calf Island 2029(NAD83)

Green spar buoy temporarily established in 44 48.668N 079 43.196W. 
NW-C-0781-25 2025-04-28 18:05 UTC Aids to Navigation Lake Simcoe, Trent-Severn Waterway - McRae Point 2028(NAD83)

Missing

Aids: Goffatt Island light buoy STA LL 1369.8
Showing results 1 to 20, from 20 total results.
Showing results 1 to 20, from 20 total results.
Compact
Showing results 1 to 20, from 20 total results.
Showing results 1 to 20, from 20 total results.
ID Date Charts Title
NW-C-1534-26 2026-05-15 20:30 UTC 2028(NAD83) Aids to Navigation

Missing

Aids: The Narrows green spar buoy S311
Cancels NW-C-1514-26
NW-C-1530-26 2026-05-15 19:11 UTC 2029(NAD83), 2029(NAD83) Lock Closed

Trent-Severn Waterway locks 42, 43, 44 and 45 are closed to navigation due to high water flows.
NW-C-1529-26 2026-05-15 18:47 UTC 2029(NAD83) Aids to Navigation

Missing

Aids: Sparrow Lake Chute red spar buoy S187
NW-C-1520-26 2026-05-15 15:48 UTC 2021(NAD83), 2022(NAD83) Aids to Navigation

Off station

Aids: Lock 14 south entrance red spar buoy T252
NW-C-1519-26 2026-05-15 15:48 UTC 2021(NAD83) Aids to Navigation

Off station

Aids: Lock 5 green spar buoy T29
NW-C-1518-26 2026-05-15 15:48 UTC 2028(NAD83) Aids to Navigation

Light Unlit

Aids: Big Bay Point light LL 1369
NW-C-1517-26 2026-05-15 15:48 UTC 2028(NAD83) Aids to Navigation

Unlit

Aids: Cook's Bay Shoal light buoy SS16 LL 1364
NW-C-1434-26 2026-05-13 18:26 UTC 2028(NAD83) Aids to Navigation

Missing

Aids: Grape Island light buoy ST LL 1369.4
NW-C-1396-26 2026-05-12 14:30 UTC 2028(NAD83) Aids to Navigation

Orange buoy temporarily established at 44 13.927N 079 28.326W to mark Keswick water treatment facility manhole. 
NW-C-1326-26 2026-05-08 13:03 UTC 2029(NAD83) Aids to Navigation

All spar buoys in the Port Severn area between lock 45 and the 400 highway bridge unreliable due to strong water flows.
NW-C-1296-26 2026-05-07 13:45 UTC 2028(NAD83) Obstruction

Subsurface scientific equipment placed 3 metres below the surface at 44 23.897N 079 34.222W and 44 23.902N 079 34.190W
NW-C-0830-26 2026-04-13 12:35 UTC 2400(NAD83) Seasonal Buoy Program

The seasonal recommissioning of Canadian Coast Guard navigational buoys is underway in the Great Lakes sector.

Mariners requiring additional information are requested to contact the appropriate MCTS Centre, Navigational Warning Issuing Desk, or visit the Canadian Coast Guard Website at the following address: https://e-navigation.canada.ca
NW-C-3545-25 2025-11-17 14:56 UTC 2028(NAD83) Obstruction

Subsurface scientific mooring temporarily established at:

44 23.890N 079 34.297W
44 23.880N 079 34.327W, 3 metres below the surface.

44 23.928N 079 34.277W
44 23.925N 079 34.308W, 8 metres below the surface.
NW-C-3177-25 2025-10-14 21:07 UTC 6038(NAD83) Aids to Navigation

Privately maintained navigational aids may be unreliable due to multiple buoys reported having discrepancies.
NW-C-2180-25 2025-07-19 16:29 UTC 2028(NAD83) Aids to Navigation

Off position, 400 metres west

Aids: Trout Shoal light buoy S323 LL 1371
NW-C-1622-25 2025-06-13 17:38 UTC 2025(NAD83), 2025(NAD83) Aids to Navigation

Green spar buoy N21 temporarily established in 44 32.276N 078 44.658W. 
NW-C-1621-25 2025-06-13 17:36 UTC 2025(NAD83), 2025(NAD83) Aids to Navigation

Temporarily removed. 

Aids: Fenelon River port daybeacon N21
NW-C-1499-25 2025-06-05 17:32 UTC 2028(NAD83) Obstruction

Subsurface scientific equipment placed 3 metres below the surface at 44 36.257N 079 22.179W
NW-C-1158-25 2025-05-17 13:17 UTC 2029(NAD83) Aids to Navigation

Green spar buoy temporarily established in 44 48.668N 079 43.196W. 
NW-C-0781-25 2025-04-28 18:05 UTC 2028(NAD83) Aids to Navigation

Missing

Aids: Goffatt Island light buoy STA LL 1369.8
Showing results 1 to 20, from 20 total results.
Showing results 1 to 20, from 20 total results.

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