NOAA S-57 chart cell
Approaches to Mobile Bay and Mississippi Sound and Gulf of America
US3AL1AA
- Usage band
- Coastal · code 3
- Current edition
- 1.0
- Features
- 1,310
- S-57 layers
- 35
- Published
- Dec 19, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 30.00000° N
- South
- 28.80000° N
- West
- 88.80000° W
- East
- 87.60000° W
- Center
- 29.40000° N, 88.20000° W
- Bounds area
- 4,522 sq nm
- Feature density
- 0.2897 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 37.4
- Smallest layer
- 1
- Largest layer
- 818
- Area sq km
- 15,511
- Features per sq km
- 0.08445
- PIPSOL 818
- OBSTRN Obstruction 96
- OFSPLF 85
- SBDARE Seabed area 80
- DEPCNT Depth contour 37
- DEPARE Depth area 33
- SOUNDG Sounding 30
- BOYSPP Special purpose buoy 28
- LIGHTS Light 24
- WRECKS Wreck 23
- M_QUAL Data quality 19
- MAGVAR Magnetic variation 4
- FAIRWY Fairway 3
- LNDARE Land area 3
- LNDMRK 3
- TESARE 3
- DMPGRD 2
- RESARE 2
- ADMARE 1
- BCNSPP Special purpose beacon 1
Nearby Chart Cells
Coastal 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/US3AL1AA.zip
- S-57 cell https://charts.openships.ai/noaa/s57/coastal/US3AL1AA/1.0/US3AL1AA.000
- GeoJSON https://charts.openships.ai/noaa/s57/coastal/US3AL1AA/1.0/US3AL1AA.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/coastal/US3AL1AA/1.0/US3AL1AA.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/coastal/US3AL1AA/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Dec 19, 2025 | metadata.json |