NOAA S-57 chart cell

Northern Massachusetts

US4MA1HC

Usage band
Approach · code 4
Current edition
1.5
Features
2,433
S-57 layers
58
Published
Aug 29, 2025
Manifest updated
Jun 22, 2026, 2:51 PM UTC

Coverage

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North
42.60000° N
South
42.30000° N
West
71.10000° W
East
70.80000° W
Center
42.45000° N, 70.95000° W
Bounds area
239 sq nm
Feature density
10.1633 / sq nm

Chart Statistics

20 largest layers shown

Average features per layer
41.9
Smallest layer
1
Largest layer
476
Area sq km
821
Features per sq km
2.96313
  1. SLCONS Shoreline construction 476
  2. COALNE Coastline 361
  3. DEPCNT Depth contour 283
  4. UWTROC Underwater rock 229
  5. DEPARE Depth area 218
  6. LNDARE Land area 142
  7. SBDARE Seabed area 103
  8. LNDRGN Land region 83
  9. BRIDGE 71
  10. BOYLAT Lateral buoy 49
  11. LIGHTS Light 44
  12. SEAARE Sea area 42
  13. OBSTRN Obstruction 41
  14. RIVERS River 41
  15. LNDMRK 31
  16. PONTON 27
  17. M_QUAL Data quality 21
  18. WRECKS Wreck 20
  19. BUAARE 15
  20. FOGSIG 15

Nearby Chart Cells

Approach usage band

  1. Northern Massachusetts US4MA1HD - about 13 nm away
  2. Northern Massachusetts US4MA1IC - about 18 nm away
  3. Northern Massachusetts US4MA1GC - about 18 nm away
  4. Northern Massachusetts US4MA1ID - about 22 nm away
  5. Duxbury Bay to Massachusetts Bay US4MA1GD - about 22 nm away
  6. Northern Massachusetts US4MA1HE - about 27 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
1.5 Aug 29, 2025 metadata.json