NOAA S-57 chart cell
Upper reaches of the Old River and Middle River
US4CA46M
- Usage band
- Approach · code 4
- Current edition
- 9.1
- Features
- 791
- S-57 layers
- 35
- Published
- Feb 23, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 37.95313° N
- South
- 37.74714° N
- West
- 121.62081° W
- East
- 121.28951° W
- Center
- 37.85014° N, 121.45516° W
- Bounds area
- 194 sq nm
- Feature density
- 4.0719 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 22.6
- Smallest layer
- 1
- Largest layer
- 172
- Area sq km
- 666
- Features per sq km
- 1.18716
- COALNE Coastline 172
- LNDARE Land area 160
- LNDRGN Land region 94
- DYKCON 75
- BRIDGE 54
- CBLOHD 40
- SLCONS Shoreline construction 28
- DEPARE Depth area 25
- M_QUAL Data quality 25
- BUAARE 17
- SEAARE Sea area 12
- DRGARE 11
- RIVERS River 11
- FAIRWY Fairway 9
- CBLARE 8
- CTNARE Caution area 8
- PYLONS 7
- DEPCNT Depth contour 5
- RESARE 5
- SMCFAC 3
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/US4CA46M.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4CA46M/9.1/US4CA46M.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4CA46M/9.1/US4CA46M.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4CA46M/9.1/US4CA46M.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4CA46M/9.1/US4CA46M.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4CA46M/9.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 9.1 | Feb 23, 2026 | metadata.json |