NOAA S-57 chart cell
Bon Secour Bay and Gulf of America
US4AL1BC
- Usage band
- Approach · code 4
- Current edition
- 6.0
- Features
- 1,359
- S-57 layers
- 55
- Published
- Mar 27, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 30.30000° N
- South
- 30.00000° N
- West
- 87.90000° W
- East
- 87.60000° W
- Center
- 30.15000° N, 87.75000° W
- Bounds area
- 281 sq nm
- Feature density
- 4.8441 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 24.7
- Smallest layer
- 1
- Largest layer
- 311
- Area sq km
- 962
- Features per sq km
- 1.41232
- SLCONS Shoreline construction 311
- COALNE Coastline 158
- DEPCNT Depth contour 123
- OBSTRN Obstruction 117
- DEPARE Depth area 94
- SBDARE Seabed area 60
- LNDRGN Land region 53
- BCNLAT Lateral beacon 46
- DAYMAR 46
- M_QUAL Data quality 41
- RETRFL 38
- PIPSOL 24
- RIVERS River 22
- BUISGL 21
- PILPNT 20
- SOUNDG Sounding 20
- PONTON 17
- WRECKS Wreck 14
- LAKARE 13
- LIGHTS Light 13
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/US4AL1BC.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AL1BC/6.0/US4AL1BC.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AL1BC/6.0/US4AL1BC.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AL1BC/6.0/US4AL1BC.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AL1BC/6.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 6.0 | Mar 27, 2026 | metadata.json |