NOAA S-57 chart cell
Approaches to San Francisco Bay - West of the Farallon Islands, CA
US4CA2BG
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 31
- S-57 layers
- 17
- Published
- Jan 16, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 37.80000° N
- South
- 37.50000° N
- West
- 123.60000° W
- East
- 123.30000° W
- Center
- 37.65000° N, 123.45000° W
- Bounds area
- 257 sq nm
- Feature density
- 0.1207 / sq nm
Chart Statistics
17 largest layers shown
- Average features per layer
- 1.8
- Smallest layer
- 1
- Largest layer
- 6
- Area sq km
- 881
- Features per sq km
- 0.03518
- SOUNDG Sounding 6
- DEPARE Depth area 3
- SBDARE Seabed area 3
- DEPCNT Depth contour 2
- DMPGRD 2
- M_NPUB 2
- RESARE 2
- SEAARE Sea area 2
- CONZNE 1
- COSARE 1
- CTNARE Caution area 1
- EXEZNE 1
- M_COVR Coverage 1
- M_NSYS 1
- M_QUAL Data quality 1
- MAGVAR Magnetic variation 1
- TESARE 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/US4CA2BG.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4CA2BG/1.0/US4CA2BG.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4CA2BG/1.0/US4CA2BG.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4CA2BG/1.0/US4CA2BG.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4CA2BG/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Jan 16, 2026 | metadata.json |