NOAA S-57 chart cell
Gulf Intracoastal Waterway - Alazan Bay, Laguna Madre to Gulf of America
US4TX1GB
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 1,739
- S-57 layers
- 40
- Published
- May 27, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 27.60000° N
- South
- 27.30000° N
- West
- 97.50000° W
- East
- 97.20000° W
- Center
- 27.45000° N, 97.35000° W
- Bounds area
- 288 sq nm
- Feature density
- 6.0401 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 43.5
- Smallest layer
- 1
- Largest layer
- 322
- Area sq km
- 988
- Features per sq km
- 1.761
- COALNE Coastline 322
- LNDRGN Land region 163
- LNDARE Land area 157
- DEPARE Depth area 156
- DEPCNT Depth contour 149
- SLCONS Shoreline construction 134
- BCNLAT Lateral beacon 71
- DAYMAR 71
- OBSTRN Obstruction 66
- RETRFL 62
- UWTROC Underwater rock 59
- BUISGL 54
- DMPGRD 45
- M_QUAL Data quality 37
- SBDARE Seabed area 23
- LAKARE 20
- LIGHTS Light 20
- OFSPLF 19
- PILPNT 17
- SEAARE Sea area 14
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/US4TX1GB.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4TX1GB/1.0/US4TX1GB.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4TX1GB/1.0/US4TX1GB.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4TX1GB/1.0/US4TX1GB.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4TX1GB/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | May 27, 2025 | metadata.json |