NOAA S-57 chart cell
Gulf Intracoastal Waterway - Mississippi Sound to Chandeleur Sound
US4LA1HQ
- Usage band
- Approach · code 4
- Current edition
- 2.2
- Features
- 1,583
- S-57 layers
- 42
- Published
- Jul 1, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 30.30000° N
- South
- 30.00000° N
- West
- 89.40000° W
- East
- 89.10000° W
- Center
- 30.15000° N, 89.25000° W
- Bounds area
- 281 sq nm
- Feature density
- 5.6426 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 37.7
- Smallest layer
- 1
- Largest layer
- 171
- Area sq km
- 962
- Features per sq km
- 1.64511
- COALNE Coastline 171
- LNDRGN Land region 160
- SBDARE Seabed area 156
- LNDARE Land area 154
- DEPARE Depth area 126
- PILPNT 126
- DEPCNT Depth contour 125
- OBSTRN Obstruction 74
- SEAARE Sea area 58
- SLCONS Shoreline construction 53
- DAYMAR 49
- WRECKS Wreck 46
- BCNLAT Lateral beacon 42
- LIGHTS Light 41
- RETRFL 41
- BUISGL 21
- M_QUAL Data quality 20
- SOUNDG Sounding 15
- UWTROC Underwater rock 14
- BCNSPP Special purpose beacon 12
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/US4LA1HQ.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4LA1HQ/2.2/US4LA1HQ.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4LA1HQ/2.2/US4LA1HQ.001
- S-57 update 002 https://charts.openships.ai/noaa/s57/approach/US4LA1HQ/2.2/US4LA1HQ.002
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4LA1HQ/2.2/US4LA1HQ.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4LA1HQ/2.2/US4LA1HQ.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4LA1HQ/2.2/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 2.2 | Jul 1, 2025 | metadata.json |