NOAA S-57 chart cell
Lake Huron - Thunder Bay and Middle Island, MI
US4MI1LI
- Usage band
- Approach · code 4
- Current edition
- 3.2
- Features
- 850
- S-57 layers
- 36
- Published
- Jan 22, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 45.30000° N
- South
- 45.00000° N
- West
- 83.40000° W
- East
- 83.10000° W
- Center
- 45.15000° N, 83.25000° W
- Bounds area
- 229 sq nm
- Feature density
- 3.7149 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 23.6
- Smallest layer
- 1
- Largest layer
- 212
- Area sq km
- 785
- Features per sq km
- 1.08308
- DEPCNT Depth contour 212
- DEPARE Depth area 204
- OBSTRN Obstruction 80
- M_QUAL Data quality 78
- SBDARE Seabed area 42
- UWTROC Underwater rock 42
- LNDARE Land area 33
- WRECKS Wreck 23
- COALNE Coastline 17
- MORFAC 16
- LIGHTS Light 15
- RIVERS River 11
- LNDRGN Land region 10
- RECTRC 10
- SEAARE Sea area 10
- SLCONS Shoreline construction 8
- SOUNDG Sounding 8
- LAKARE 5
- BOYLAT Lateral buoy 3
- BUISGL 3
Nearby Chart Cells
Approach usage band
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.
- Original NOAA ZIP archive https://www.charts.noaa.gov/ENCs/US4MI1LI.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4MI1LI/3.2/US4MI1LI.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4MI1LI/3.2/US4MI1LI.001
- S-57 update 002 https://charts.openships.ai/noaa/s57/approach/US4MI1LI/3.2/US4MI1LI.002
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4MI1LI/3.2/US4MI1LI.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4MI1LI/3.2/US4MI1LI.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4MI1LI/3.2/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 3.2 | Jan 22, 2026 | metadata.json |