NOAA S-57 chart cell
Gulf Intracoastal Waterway - Lake Borgne and Lake Pontchartrain
US4LA1HO
- Usage band
- Approach · code 4
- Current edition
- 2.1
- Features
- 3,017
- S-57 layers
- 54
- Published
- Nov 12, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 30.30000° N
- South
- 30.00000° N
- West
- 90.00000° W
- East
- 89.70000° W
- Center
- 30.15000° N, 89.85000° W
- Bounds area
- 281 sq nm
- Feature density
- 10.754 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 55.9
- Smallest layer
- 1
- Largest layer
- 370
- Area sq km
- 962
- Features per sq km
- 3.13538
- COALNE Coastline 370
- SLCONS Shoreline construction 354
- LNDRGN Land region 281
- DEPARE Depth area 279
- RIVERS River 267
- LNDARE Land area 224
- DEPCNT Depth contour 214
- LAKARE 168
- OBSTRN Obstruction 87
- SBDARE Seabed area 85
- M_QUAL Data quality 71
- DAYMAR 68
- SEAARE Sea area 66
- PILPNT 64
- BCNLAT Lateral beacon 56
- LIGHTS Light 52
- WRECKS Wreck 46
- BRIDGE 41
- BCNSPP Special purpose beacon 26
- SOUNDG Sounding 19
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/US4LA1HO.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4LA1HO/2.1/US4LA1HO.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4LA1HO/2.1/US4LA1HO.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4LA1HO/2.1/US4LA1HO.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4LA1HO/2.1/US4LA1HO.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4LA1HO/2.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 2.1 | Nov 12, 2025 | metadata.json |