NOAA S-57 chart cell
Saginaw Bay - Au Sable Point, MI
US4MI1II
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 78
- S-57 layers
- 21
- Published
- Oct 19, 2023
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 44.40000° N
- South
- 44.10000° N
- West
- 83.40000° W
- East
- 83.10000° W
- Center
- 44.25000° N, 83.25000° W
- Bounds area
- 232 sq nm
- Feature density
- 0.3356 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 3.7
- Smallest layer
- 1
- Largest layer
- 19
- Area sq km
- 797
- Features per sq km
- 0.09786
- DEPARE Depth area 19
- DEPCNT Depth contour 18
- SBDARE Seabed area 9
- OBSTRN Obstruction 5
- RECTRC 4
- LIGHTS Light 3
- M_QUAL Data quality 3
- MAGVAR Magnetic variation 3
- SEAARE Sea area 2
- BOYLAT Lateral buoy 1
- COALNE Coastline 1
- LNDARE Land area 1
- LNDMRK 1
- LNDRGN Land region 1
- M_COVR Coverage 1
- M_NPUB 1
- M_NSYS 1
- RESARE 1
- SILTNK 1
- SOUNDG Sounding 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/US4MI1II.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4MI1II/1.0/US4MI1II.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4MI1II/1.0/US4MI1II.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4MI1II/1.0/US4MI1II.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4MI1II/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Oct 19, 2023 | metadata.json |