NOAA S-57 chart cell
Block Island Sound and Approaches
US4CN22M
- Usage band
- Approach · code 4
- Current edition
- 20.1
- Features
- 37
- S-57 layers
- 15
- Published
- Dec 17, 2024
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 41.24983° N
- South
- 40.65734° N
- West
- 72.26226° W
- East
- 71.45332° W
- Center
- 40.95358° N, 71.85779° W
- Bounds area
- 1,305 sq nm
- Feature density
- 0.0284 / sq nm
Chart Statistics
15 largest layers shown
- Average features per layer
- 2.5
- Smallest layer
- 1
- Largest layer
- 7
- Area sq km
- 4,476
- Features per sq km
- 0.00827
- SBDARE Seabed area 7
- DEPARE Depth area 6
- DEPCNT Depth contour 5
- M_QUAL Data quality 3
- SOUNDG Sounding 3
- CBLSUB 2
- M_COVR Coverage 2
- RESARE 2
- CONZNE 1
- CTNARE Caution area 1
- EXEZNE 1
- M_NPUB 1
- M_NSYS 1
- MAGVAR Magnetic variation 1
- TESARE 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/US4CN22M.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4CN22M/20.1/US4CN22M.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4CN22M/20.1/US4CN22M.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4CN22M/20.1/US4CN22M.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4CN22M/20.1/US4CN22M.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4CN22M/20.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 20.1 | Dec 17, 2024 | metadata.json |