NOAA S-57 chart cell
Duxbury Bay to Massachusetts Bay
US4MA1GD
- Usage band
- Approach · code 4
- Current edition
- 1.1
- Features
- 1,403
- S-57 layers
- 48
- Published
- Sep 19, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 42.30000° N
- South
- 42.00000° N
- West
- 70.80000° W
- East
- 70.50000° W
- Center
- 42.15000° N, 70.65000° W
- Bounds area
- 241 sq nm
- Feature density
- 5.8328 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 29.2
- Smallest layer
- 1
- Largest layer
- 189
- Area sq km
- 825
- Features per sq km
- 1.70058
- DEPCNT Depth contour 189
- UWTROC Underwater rock 189
- DEPARE Depth area 169
- COALNE Coastline 146
- RIVERS River 139
- SLCONS Shoreline construction 93
- LNDRGN Land region 89
- SBDARE Seabed area 87
- LNDARE Land area 55
- M_QUAL Data quality 28
- SEAARE Sea area 28
- BOYLAT Lateral buoy 22
- OBSTRN Obstruction 20
- BUISGL 17
- LIGHTS Light 14
- BUAARE 13
- LNDMRK 11
- WRECKS Wreck 11
- BRIDGE 10
- LAKARE 9
Nearby Chart Cells
Approach usage band
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.
- Original NOAA ZIP archive https://www.charts.noaa.gov/ENCs/US4MA1GD.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4MA1GD/1.1/US4MA1GD.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4MA1GD/1.1/US4MA1GD.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4MA1GD/1.1/US4MA1GD.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4MA1GD/1.1/US4MA1GD.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4MA1GD/1.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.1 | Sep 19, 2025 | metadata.json |