NOAA S-57 chart cell
Rat Islands, AK
US4AK1CV
- Usage band
- Approach · code 4
- Current edition
- 1.1
- Features
- 757
- S-57 layers
- 27
- Published
- Apr 1, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 51.90000° N
- South
- 51.60000° N
- West
- 177.00000° E
- East
- 177.60000° E
- Center
- 51.75000° N, 177.30000° E
- Bounds area
- 402 sq nm
- Feature density
- 1.8844 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 28
- Smallest layer
- 1
- Largest layer
- 293
- Area sq km
- 1,378
- Features per sq km
- 0.54941
- LNDARE Land area 293
- DEPCNT Depth contour 145
- DEPARE Depth area 134
- COALNE Coastline 74
- SBDARE Seabed area 28
- RIVERS River 15
- UWTROC Underwater rock 14
- LNDELV 7
- LNDRGN Land region 7
- WEDKLP 7
- SEAARE Sea area 5
- M_QUAL Data quality 4
- SOUNDG Sounding 4
- WATTUR 4
- MAGVAR Magnetic variation 3
- M_NPUB 2
- ADMARE 1
- CONZNE 1
- COSARE 1
- CTNARE Caution area 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/US4AK1CV.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4AK1CV/1.1/US4AK1CV.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4AK1CV/1.1/US4AK1CV.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK1CV/1.1/US4AK1CV.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK1CV/1.1/US4AK1CV.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK1CV/1.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.1 | Apr 1, 2026 | metadata.json |