NOAA S-57 chart cell
Gulf Intracoastal Waterway - Southern Laguna Madre - Port Harlingen Channel
US4TX1BB
- Usage band
- Approach · code 4
- Current edition
- 4.0
- Features
- 1,189
- S-57 layers
- 43
- Published
- Oct 2, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 26.40000° N
- South
- 26.10000° N
- West
- 97.50000° W
- East
- 97.20000° W
- Center
- 26.25000° N, 97.35000° W
- Bounds area
- 291 sq nm
- Feature density
- 4.0862 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 27.7
- Smallest layer
- 1
- Largest layer
- 177
- Area sq km
- 998
- Features per sq km
- 1.19135
- COALNE Coastline 177
- DEPARE Depth area 106
- LNDARE Land area 105
- DEPCNT Depth contour 93
- LNDRGN Land region 92
- PILPNT 78
- BCNLAT Lateral beacon 64
- DAYMAR 64
- RETRFL 63
- OBSTRN Obstruction 54
- OFSPLF 34
- M_QUAL Data quality 32
- DMPGRD 26
- BOYLAT Lateral buoy 20
- LIGHTS Light 19
- UNSARE 18
- SEAARE Sea area 15
- SLCONS Shoreline construction 15
- LAKARE 14
- CTNARE Caution area 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/US4TX1BB.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4TX1BB/4.0/US4TX1BB.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4TX1BB/4.0/US4TX1BB.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4TX1BB/4.0/US4TX1BB.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4TX1BB/4.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 4.0 | Oct 2, 2025 | metadata.json |