NOAA S-57 chart cell

Lake Huron - Forty Mile Point to Adams Point, MI

US4MI1NF

Usage band
Approach · code 4
Current edition
1.2
Features
158
S-57 layers
25
Published
Nov 24, 2025
Manifest updated
Jun 22, 2026, 2:51 PM UTC

Coverage

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North
45.90000° N
South
45.60000° N
West
84.30000° W
East
84.00000° W
Center
45.75000° N, 84.15000° W
Bounds area
226 sq nm
Feature density
0.6979 / sq nm

Chart Statistics

20 largest layers shown

Average features per layer
6.3
Smallest layer
1
Largest layer
31
Area sq km
776
Features per sq km
0.20348
  1. DEPCNT Depth contour 31
  2. DEPARE Depth area 30
  3. RECTRC 23
  4. SBDARE Seabed area 20
  5. UWTROC Underwater rock 12
  6. M_QUAL Data quality 8
  7. RIVERS River 6
  8. OBSTRN Obstruction 3
  9. SEAARE Sea area 3
  10. BOYLAT Lateral buoy 2
  11. COALNE Coastline 2
  12. LNDARE Land area 2
  13. LNDMRK 2
  14. RESARE 2
  15. SOUNDG Sounding 2
  16. CBLSUB 1
  17. LIGHTS Light 1
  18. LNDRGN Land region 1
  19. M_COVR Coverage 1
  20. M_NPUB 1

Nearby Chart Cells

Approach usage band

  1. Lake Huron - Straits of Mackinac to Cheboygan River, MI US4MI1NE - about 13 nm away
  2. Lake Huron - Spectacle Reef and Raynolds Reef, MI US4MI1NG - about 13 nm away
  3. Lake Huron - Hammond Bay, MI US4MI1MF - about 18 nm away
  4. Lake Huron - Saint Mary's River, Entrance to Munuscong Lake, MI US4MI1OF - about 18 nm away
  5. Lake Huron - Saint Martin Bay to Marquette Island, MI US4MI1OE - about 22 nm away
  6. Lake Huron - Entrance to Saint Mary's River, Drummond Island, MI US4MI1OG - about 22 nm away

Current Edition Files

The NOAA ZIP archive is the upstream source for this chart cell; the other files are Open Ships generated derivatives for web and GIS use.

Editions

Edition Published Metadata
1.2 Nov 24, 2025 metadata.json