NOAA S-57 chart cell

Gulf Intracoastal Waterway - Approaches to Freeport Harbor

US4TX1LI

Usage band
Approach · code 4
Current edition
3.3
Features
2,110
S-57 layers
64
Published
Dec 3, 2025
Manifest updated
Jun 22, 2026, 2:51 PM UTC

Coverage

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North
29.10000° N
South
28.80000° N
West
95.40000° W
East
95.10000° W
Center
28.95000° N, 95.25000° W
Bounds area
284 sq nm
Feature density
7.4323 / sq nm

Chart Statistics

20 largest layers shown

Average features per layer
33
Smallest layer
1
Largest layer
257
Area sq km
974
Features per sq km
2.16691
  1. DEPARE Depth area 257
  2. COALNE Coastline 256
  3. DEPCNT Depth contour 244
  4. SLCONS Shoreline construction 217
  5. LNDRGN Land region 117
  6. RIVERS River 117
  7. LNDARE Land area 79
  8. OBSTRN Obstruction 76
  9. LAKARE 71
  10. DYKCON 59
  11. SBDARE Seabed area 56
  12. PILPNT 51
  13. M_QUAL Data quality 35
  14. LIGHTS Light 34
  15. CBLOHD 32
  16. WRECKS Wreck 31
  17. CTNARE Caution area 28
  18. MORFAC 26
  19. SEAARE Sea area 26
  20. SOUNDG Sounding 26

Nearby Chart Cells

Approach usage band

  1. Gulf Intracoastal Waterway - San Bernard River and Gulf of America US4TX1LH - about 16 nm away
  2. Gulf of America to San Luis Pass US4TX1LJ - about 16 nm away
  3. Gulf Intracoastal Waterway - West Bay and Chocolate Bay US4TX1MI - about 18 nm away
  4. Gulf of America US4TX1KI - about 18 nm away
  5. Gulf Intracoastal Waterway - Galveston Bay, West Bay to Gulf of America US4TX1MJ - about 24 nm away
  6. Gulf Intracoastal Waterway - East Matagorda Bay and Gulf of America US4TX1KH - about 24 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
3.3 Dec 3, 2025 metadata.json