NOAA S-57 chart cell
Lake Michigan - Offshore of Algoma, WI
US4WI1IR
- Usage band
- Approach · code 4
- Current edition
- 2.0
- Features
- 18
- S-57 layers
- 11
- Published
- Aug 15, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 44.70000° N
- South
- 44.40000° N
- West
- 87.30000° W
- East
- 87.00000° W
- Center
- 44.55000° N, 87.15000° W
- Bounds area
- 231 sq nm
- Feature density
- 0.0779 / sq nm
Chart Statistics
11 largest layers shown
- Average features per layer
- 1.6
- Smallest layer
- 1
- Largest layer
- 4
- Area sq km
- 793
- Features per sq km
- 0.0227
- RECTRC 4
- SOUNDG Sounding 4
- M_NPUB 2
- CBLSUB 1
- DEPARE Depth area 1
- M_COVR Coverage 1
- M_NSYS 1
- M_QUAL Data quality 1
- MAGVAR Magnetic variation 1
- RESARE 1
- SEAARE Sea area 1
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/US4WI1IR.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4WI1IR/2.0/US4WI1IR.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4WI1IR/2.0/US4WI1IR.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4WI1IR/2.0/US4WI1IR.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4WI1IR/2.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 2.0 | Aug 15, 2025 | metadata.json |