NOAA S-57 chart cell
Gulf of America
US4LA1ER
- Usage band
- Approach · code 4
- Current edition
- 3.1
- Features
- 348
- S-57 layers
- 22
- Published
- Aug 7, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 29.40000° N
- South
- 29.10000° N
- West
- 88.80000° W
- East
- 88.50000° W
- Center
- 29.25000° N, 88.65000° W
- Bounds area
- 283 sq nm
- Feature density
- 1.2294 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 15.8
- Smallest layer
- 1
- Largest layer
- 216
- Area sq km
- 971
- Features per sq km
- 0.35843
- PIPSOL 216
- OFSPLF 38
- OBSTRN Obstruction 21
- SBDARE Seabed area 16
- DEPCNT Depth contour 9
- SOUNDG Sounding 9
- DEPARE Depth area 6
- M_QUAL Data quality 6
- WRECKS Wreck 6
- BOYSPP Special purpose buoy 4
- LIGHTS Light 3
- CTNARE Caution area 2
- M_NPUB 2
- MAGVAR Magnetic variation 2
- CONZNE 1
- EXEZNE 1
- FAIRWY Fairway 1
- M_COVR Coverage 1
- M_NSYS 1
- MORFAC 1
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/US4LA1ER.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4LA1ER/3.1/US4LA1ER.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4LA1ER/3.1/US4LA1ER.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4LA1ER/3.1/US4LA1ER.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4LA1ER/3.1/US4LA1ER.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4LA1ER/3.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 3.1 | Aug 7, 2025 | metadata.json |