NOAA S-57 chart cell

approaches to Galveston Bay

US4TX1ML

Usage band
Approach · code 4
Current edition
1.2
Features
240
S-57 layers
29
Published
May 30, 2025
Manifest updated
Jun 22, 2026, 2:51 PM UTC

Coverage

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North
29.40000° N
South
29.10000° N
West
94.50000° W
East
94.20000° W
Center
29.25000° N, 94.35000° W
Bounds area
283 sq nm
Feature density
0.8478 / sq nm

Chart Statistics

20 largest layers shown

Average features per layer
8.3
Smallest layer
1
Largest layer
83
Area sq km
971
Features per sq km
0.24719
  1. PIPSOL 83
  2. SBDARE Seabed area 40
  3. OBSTRN Obstruction 29
  4. OFSPLF 23
  5. M_QUAL Data quality 17
  6. SOUNDG Sounding 9
  7. LIGHTS Light 5
  8. WRECKS Wreck 5
  9. BOYSPP Special purpose buoy 3
  10. MAGVAR Magnetic variation 3
  11. ACHARE Anchorage area 2
  12. SEAARE Sea area 2
  13. TSSBND 2
  14. TSSLPT 2
  15. ADMARE 1
  16. BOYISD 1
  17. BOYSAW 1
  18. C_AGGR 1
  19. CONZNE 1
  20. DEPARE Depth area 1

Nearby Chart Cells

Approach usage band

  1. Gulf of America - Sabine Bank to Heald Bank US4TX1MM - about 16 nm away
  2. Approaches to Galveston Bay US4TX1MK - about 16 nm away
  3. Gulf Intracoastal Waterway - East Bay to Gulf of America US4TX1NL - about 18 nm away
  4. Gulf of America US4TX1LL - about 18 nm away
  5. Gulf Intracoastal Waterway - Sabine Bank - Gulf of America US4TX1NM - about 24 nm away
  6. Gulf Intracoastal Waterway - Galveston Bay, East Bay, Trinity Bay to Gulf of America US4TX1NK - 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
1.2 May 30, 2025 metadata.json