NOAA S-57 chart cell
North Shore of Long Island Sound, Norwalk Harbor to Southport Harbor
US4CT1AA
- Usage band
- Approach · code 4
- Current edition
- 2.0
- Features
- 680
- S-57 layers
- 44
- Published
- Mar 25, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 41.40000° N
- South
- 41.10000° N
- West
- 73.50000° W
- East
- 73.20000° W
- Center
- 41.25000° N, 73.35000° W
- Bounds area
- 244 sq nm
- Feature density
- 2.7877 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 15.5
- Smallest layer
- 1
- Largest layer
- 121
- Area sq km
- 837
- Features per sq km
- 0.81278
- SLCONS Shoreline construction 121
- UWTROC Underwater rock 79
- COALNE Coastline 64
- LNDRGN Land region 53
- SBDARE Seabed area 52
- DEPCNT Depth contour 34
- DEPARE Depth area 22
- M_QUAL Data quality 22
- OBSTRN Obstruction 20
- LNDARE Land area 17
- LIGHTS Light 16
- RIVERS River 16
- BOYLAT Lateral buoy 15
- SEAARE Sea area 15
- BRIDGE 14
- LNDMRK 13
- SOUNDG Sounding 12
- LAKARE 11
- BUAARE 10
- SILTNK 8
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/US4CT1AA.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4CT1AA/2.0/US4CT1AA.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4CT1AA/2.0/US4CT1AA.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4CT1AA/2.0/US4CT1AA.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4CT1AA/2.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 2.0 | Mar 25, 2026 | metadata.json |