NOAA S-57 chart cell

Lake Maurepas

US4LA1IL

Usage band
Approach · code 4
Current edition
1.2
Features
215
S-57 layers
32
Published
Jul 2, 2025
Manifest updated
Jun 22, 2026, 2:51 PM UTC

Coverage

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North
30.60000° N
South
30.30000° N
West
90.60000° W
East
90.30000° W
Center
30.45000° N, 90.45000° W
Bounds area
280 sq nm
Feature density
0.7687 / sq nm

Chart Statistics

20 largest layers shown

Average features per layer
6.7
Smallest layer
1
Largest layer
49
Area sq km
959
Features per sq km
0.22412
  1. COALNE Coastline 49
  2. LNDRGN Land region 29
  3. CBLOHD 17
  4. SEAARE Sea area 15
  5. DRGARE 10
  6. LNDARE Land area 10
  7. RIVERS River 10
  8. BRIDGE 8
  9. CANALS 8
  10. DEPARE Depth area 6
  11. M_QUAL Data quality 6
  12. SLCONS Shoreline construction 6
  13. FAIRWY Fairway 5
  14. DEPCNT Depth contour 4
  15. SBDARE Seabed area 4
  16. CTNARE Caution area 3
  17. LIGHTS Light 3
  18. OBSTRN Obstruction 3
  19. SOUNDG Sounding 3
  20. BOYLAT Lateral buoy 2

Nearby Chart Cells

Approach usage band

  1. Lake Pontchartrain US4LA1IM - about 16 nm away
  2. Mississippi River, Lake Pontchartrain, and Lake Maurepas US4LA1HL - about 18 nm away
  3. Lake Pontchartrain US4LA1HM - about 24 nm away
  4. Mississippi River and Blind River US4LA1HK - about 24 nm away
  5. West Pearl River and Lacombe Bayou US4LA1IN - about 31 nm away
  6. Mississippi River, Manchac Bend, and Baton Rouge US4LA1IJ - 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
1.2 Jul 2, 2025 metadata.json