NOAA S-57 chart cell
Lake Michigan - Offshore of Evanston, IL
US4IL1YY
- Usage band
- Approach · code 4
- Current edition
- 2.0
- Features
- 51
- S-57 layers
- 15
- Published
- May 19, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 42.30000° N
- South
- 42.00000° N
- West
- 87.60000° W
- East
- 87.30000° W
- Center
- 42.15000° N, 87.45000° W
- Bounds area
- 241 sq nm
- Feature density
- 0.212 / sq nm
Chart Statistics
15 largest layers shown
- Average features per layer
- 3.4
- Smallest layer
- 1
- Largest layer
- 10
- Area sq km
- 825
- Features per sq km
- 0.06182
- RECTRC 10
- DEPARE Depth area 9
- DEPCNT Depth contour 8
- M_QUAL Data quality 6
- SOUNDG Sounding 6
- BOYLAT Lateral buoy 2
- SBDARE Seabed area 2
- FOGSIG 1
- LIGHTS Light 1
- M_COVR Coverage 1
- M_NPUB 1
- M_NSYS 1
- MAGVAR Magnetic variation 1
- OBSTRN Obstruction 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/US4IL1YY.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4IL1YY/2.0/US4IL1YY.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4IL1YY/2.0/US4IL1YY.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4IL1YY/2.0/US4IL1YY.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4IL1YY/2.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 2.0 | May 19, 2025 | metadata.json |