NOAA S-57 chart cell
Gulf of America to Petit Bois Pass and Mississippi Sound
US4AL1BA
- Usage band
- Approach · code 4
- Current edition
- 4.0
- Features
- 807
- S-57 layers
- 49
- Published
- Mar 26, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 30.30000° N
- South
- 30.00000° N
- West
- 88.50000° W
- East
- 88.20000° W
- Center
- 30.15000° N, 88.35000° W
- Bounds area
- 281 sq nm
- Feature density
- 2.8765 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 16.5
- Smallest layer
- 1
- Largest layer
- 151
- Area sq km
- 962
- Features per sq km
- 0.83866
- DEPCNT Depth contour 151
- DEPARE Depth area 124
- SBDARE Seabed area 82
- M_QUAL Data quality 75
- PIPSOL 61
- OBSTRN Obstruction 44
- SOUNDG Sounding 34
- LIGHTS Light 31
- DAYMAR 25
- BCNSPP Special purpose beacon 18
- BCNLAT Lateral beacon 17
- COALNE Coastline 14
- OFSPLF 14
- WRECKS Wreck 11
- PILPNT 10
- RETRFL 9
- LNDRGN Land region 8
- MAGVAR Magnetic variation 7
- FAIRWY Fairway 6
- BOYLAT Lateral buoy 5
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/US4AL1BA.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AL1BA/4.0/US4AL1BA.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AL1BA/4.0/US4AL1BA.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AL1BA/4.0/US4AL1BA.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AL1BA/4.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 4.0 | Mar 26, 2026 | metadata.json |