NOAA S-57 chart cell
Gulf Intracoastal Waterway - Gulf of America and Calcasieu Lake, Mermentau River
US4LA1GC
- Usage band
- Approach · code 4
- Current edition
- 1.1
- Features
- 688
- S-57 layers
- 47
- Published
- Jul 11, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 30.00000° N
- South
- 29.70000° N
- West
- 93.30000° W
- East
- 93.00000° W
- Center
- 29.85000° N, 93.15000° W
- Bounds area
- 281 sq nm
- Feature density
- 2.445 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 14.6
- Smallest layer
- 1
- Largest layer
- 74
- Area sq km
- 965
- Features per sq km
- 0.71284
- BUISGL 74
- COALNE Coastline 72
- LNDRGN Land region 58
- SLCONS Shoreline construction 55
- SBDARE Seabed area 44
- PILPNT 40
- DEPARE Depth area 32
- PIPSOL 31
- LAKARE 29
- CANALS 19
- OBSTRN Obstruction 19
- RIVERS River 18
- DEPCNT Depth contour 14
- LNDARE Land area 14
- M_QUAL Data quality 14
- OFSPLF 13
- WRECKS Wreck 12
- DYKCON 11
- SOUNDG Sounding 10
- LNDMRK 9
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/US4LA1GC.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4LA1GC/1.1/US4LA1GC.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4LA1GC/1.1/US4LA1GC.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4LA1GC/1.1/US4LA1GC.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4LA1GC/1.1/US4LA1GC.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4LA1GC/1.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.1 | Jul 11, 2025 | metadata.json |