NOAA S-57 chart cell
Mobile Bay and Mobile River
US4AL1DB
- Usage band
- Approach · code 4
- Current edition
- 6.0
- Features
- 3,220
- S-57 layers
- 59
- Published
- Feb 26, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 30.90000° N
- South
- 30.60000° N
- West
- 88.20000° W
- East
- 87.90000° W
- Center
- 30.75000° N, 88.05000° W
- Bounds area
- 279 sq nm
- Feature density
- 11.5485 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 54.6
- Smallest layer
- 1
- Largest layer
- 369
- Area sq km
- 956
- Features per sq km
- 3.36701
- SLCONS Shoreline construction 369
- COALNE Coastline 341
- DEPARE Depth area 327
- DEPCNT Depth contour 318
- OBSTRN Obstruction 247
- MORFAC 188
- RIVERS River 170
- PILPNT 168
- LNDRGN Land region 162
- BUISGL 109
- LNDARE Land area 99
- SILTNK 77
- BRIDGE 69
- DRGARE 51
- SEAARE Sea area 48
- CBLOHD 47
- OFSPLF 43
- M_QUAL Data quality 37
- DAYMAR 32
- DYKCON 30
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/US4AL1DB.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AL1DB/6.0/US4AL1DB.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AL1DB/6.0/US4AL1DB.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AL1DB/6.0/US4AL1DB.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AL1DB/6.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 6.0 | Feb 26, 2026 | metadata.json |