NOAA S-57 chart cell

Trinity Bay to Lake Anahuac

US4TX1OK

Usage band
Approach · code 4
Current edition
2.1
Features
1,348
S-57 layers
41
Published
Sep 24, 2025
Manifest updated
Jun 22, 2026, 2:51 PM UTC

Coverage

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North
30.00000° N
South
29.70000° N
West
94.80000° W
East
94.50000° W
Center
29.85000° N, 94.65000° W
Bounds area
281 sq nm
Feature density
4.7904 / sq nm

Chart Statistics

20 largest layers shown

Average features per layer
32.9
Smallest layer
1
Largest layer
219
Area sq km
965
Features per sq km
1.39666
  1. LNDARE Land area 219
  2. COALNE Coastline 210
  3. RIVERS River 197
  4. SLCONS Shoreline construction 124
  5. PILPNT 108
  6. LNDRGN Land region 83
  7. LAKARE 48
  8. OFSPLF 44
  9. DEPCNT Depth contour 42
  10. DEPARE Depth area 41
  11. BUISGL 33
  12. OBSTRN Obstruction 33
  13. VEGATN 21
  14. SEAARE Sea area 17
  15. BCNSPP Special purpose beacon 16
  16. DYKCON 16
  17. M_QUAL Data quality 15
  18. SBDARE Seabed area 14
  19. MORFAC 10
  20. DAYMAR 9

Nearby Chart Cells

Approach usage band

  1. Trinity Bay to San Jacinto River US4TX1OJ - about 16 nm away
  2. Gulf Intracoastal Waterway - Galveston Bay, East Bay, Trinity Bay to Gulf of America US4TX1NK - about 18 nm away
  3. Galveston Bay and Trinity Bay US4TX1NJ - about 24 nm away
  4. Gulf Intracoastal Waterway - East Bay to Gulf of America US4TX1NL - about 24 nm away
  5. Gulf Intracoastal Waterway - Sabine Neches Canal, Sabine Lake, and Neches River US4TX1OM - about 31 nm away
  6. Texas - Buffalo Bayou US4TX1OI - about 31 nm away

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.

Editions

Edition Published Metadata
2.1 Sep 24, 2025 metadata.json