NOAA S-57 chart cell

Mississippi River and Gulf Intracoastal Waterway

US4LA1GM

Usage band
Approach · code 4
Current edition
2.8
Features
2,731
S-57 layers
69
Published
Apr 21, 2026
Manifest updated
Jun 22, 2026, 2:51 PM UTC

Coverage

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North
30.00000° N
South
29.70000° N
West
90.30000° W
East
90.00000° W
Center
29.85000° N, 90.15000° W
Bounds area
281 sq nm
Feature density
9.7052 / sq nm

Chart Statistics

20 largest layers shown

Average features per layer
39.6
Smallest layer
1
Largest layer
412
Area sq km
965
Features per sq km
2.82959
  1. COALNE Coastline 412
  2. SLCONS Shoreline construction 394
  3. BUISGL 182
  4. DEPARE Depth area 176
  5. DEPCNT Depth contour 146
  6. DYKCON 92
  7. WRECKS Wreck 85
  8. MORFAC 81
  9. LNDRGN Land region 79
  10. LIGHTS Light 75
  11. RIVERS River 74
  12. OBSTRN Obstruction 68
  13. BUAARE 58
  14. SEAARE Sea area 58
  15. SILTNK 52
  16. BCNLAT Lateral beacon 50
  17. M_QUAL Data quality 47
  18. LNDARE Land area 42
  19. PYLONS 42
  20. SOUNDG Sounding 42

Nearby Chart Cells

Approach usage band

  1. Mississippi River and Lake Salvador US4LA1GL - about 16 nm away
  2. Louisiana US4LA1GN - about 16 nm away
  3. Lake Pontchartrain US4LA1HM - about 18 nm away
  4. Gulf Intracoastal Waterway and Lake Salvador US4LA1FM - about 18 nm away
  5. Mississippi River, Lake Pontchartrain, and Lake Maurepas US4LA1HL - about 24 nm away
  6. Gulf Intracoastal Waterway - Lake Borgne and Lake Pontchartrain US4LA1HO - 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
2.8 Apr 21, 2026 metadata.json