NOAA S-57 chart cell

Northern Massachusetts

US4MA1HD

Usage band
Approach · code 4
Current edition
1.9
Features
1,050
S-57 layers
54
Published
Jun 3, 2026
Manifest updated
Jun 22, 2026, 2:51 PM UTC

Coverage

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North
42.60000° N
South
42.30000° N
West
70.80000° W
East
70.50000° W
Center
42.45000° N, 70.65000° W
Bounds area
239 sq nm
Feature density
4.3861 / sq nm

Chart Statistics

20 largest layers shown

Average features per layer
19.4
Smallest layer
1
Largest layer
193
Area sq km
821
Features per sq km
1.27879
  1. DEPCNT Depth contour 193
  2. DEPARE Depth area 176
  3. SBDARE Seabed area 127
  4. COALNE Coastline 90
  5. UWTROC Underwater rock 77
  6. WRECKS Wreck 65
  7. SLCONS Shoreline construction 40
  8. BOYLAT Lateral buoy 29
  9. LNDARE Land area 25
  10. LIGHTS Light 22
  11. SOUNDG Sounding 22
  12. SEAARE Sea area 21
  13. RESARE 15
  14. OBSTRN Obstruction 12
  15. RIVERS River 12
  16. BOYSPP Special purpose buoy 11
  17. LNDRGN Land region 11
  18. LAKARE 10
  19. M_QUAL Data quality 10
  20. CTNARE Caution area 8

Nearby Chart Cells

Approach usage band

  1. Northern Massachusetts US4MA1HC - about 13 nm away
  2. Northern Massachusetts US4MA1HE - about 13 nm away
  3. Northern Massachusetts US4MA1ID - about 18 nm away
  4. Duxbury Bay to Massachusetts Bay US4MA1GD - about 18 nm away
  5. Northern Massachusetts US4MA1IC - about 22 nm away
  6. Northern Massachusetts US4MA1IE - about 22 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
1.9 Jun 3, 2026 metadata.json