NOAA S-57 chart cell

Lake Pontchartrain

US4LA1HM

Usage band
Approach · code 4
Current edition
2.1
Features
820
S-57 layers
46
Published
Mar 26, 2026
Manifest updated
Jun 22, 2026, 2:51 PM UTC

Coverage

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North
30.30000° N
South
30.00000° N
West
90.30000° W
East
90.00000° W
Center
30.15000° N, 90.15000° W
Bounds area
281 sq nm
Feature density
2.9229 / sq nm

Chart Statistics

20 largest layers shown

Average features per layer
17.8
Smallest layer
1
Largest layer
98
Area sq km
962
Features per sq km
0.85217
  1. SBDARE Seabed area 98
  2. LIGHTS Light 81
  3. SLCONS Shoreline construction 78
  4. BCNSPP Special purpose beacon 46
  5. BUISGL 45
  6. DAYMAR 42
  7. OBSTRN Obstruction 37
  8. PILPNT 37
  9. BCNLAT Lateral beacon 36
  10. DEPARE Depth area 35
  11. COALNE Coastline 34
  12. DEPCNT Depth contour 30
  13. BRIDGE 29
  14. WRECKS Wreck 27
  15. BOYSPP Special purpose buoy 24
  16. OFSPLF 23
  17. M_QUAL Data quality 14
  18. DYKCON 10
  19. BUAARE 9
  20. SOUNDG Sounding 9

Nearby Chart Cells

Approach usage band

  1. Mississippi River, Lake Pontchartrain, and Lake Maurepas US4LA1HL - about 16 nm away
  2. Gulf Intracoastal Waterway - Lake Borgne and Lake Pontchartrain US4LA1HO - about 16 nm away
  3. Mississippi River and Gulf Intracoastal Waterway US4LA1GM - about 18 nm away
  4. Lake Pontchartrain US4LA1IM - about 18 nm away
  5. Lake Maurepas US4LA1IL - about 24 nm away
  6. West Pearl River and Lacombe Bayou US4LA1IN - 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
2.1 Mar 26, 2026 metadata.json