NOAA S-57 chart cell
Approaches to Chesapeake Bay
US4VA1BJ
- Usage band
- Approach · code 4
- Current edition
- 1.1
- Features
- 55
- S-57 layers
- 12
- Published
- May 4, 2023
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 37.20000° N
- South
- 36.90000° N
- West
- 75.00000° W
- East
- 74.70000° W
- Center
- 37.05000° N, 74.85000° W
- Bounds area
- 259 sq nm
- Feature density
- 0.2124 / sq nm
Chart Statistics
12 largest layers shown
- Average features per layer
- 4.6
- Smallest layer
- 1
- Largest layer
- 13
- Area sq km
- 888
- Features per sq km
- 0.06193
- DEPARE Depth area 13
- DEPCNT Depth contour 12
- SBDARE Seabed area 12
- M_QUAL Data quality 7
- SOUNDG Sounding 3
- M_NPUB 2
- DMPGRD 1
- M_COVR Coverage 1
- M_NSYS 1
- MAGVAR Magnetic variation 1
- SEAARE Sea area 1
- WRECKS Wreck 1
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/US4VA1BJ.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4VA1BJ/1.1/US4VA1BJ.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4VA1BJ/1.1/US4VA1BJ.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4VA1BJ/1.1/US4VA1BJ.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4VA1BJ/1.1/US4VA1BJ.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4VA1BJ/1.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.1 | May 4, 2023 | metadata.json |