NOAA S-57 chart cell
Chirikof Island, AK
US4AK4CA
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 232
- S-57 layers
- 26
- Published
- Jan 19, 2024
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 55.80000° N
- South
- 55.50000° N
- West
- 156.00000° W
- East
- 155.40000° W
- Center
- 55.65000° N, 155.70000° W
- Bounds area
- 366 sq nm
- Feature density
- 0.6337 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 8.9
- Smallest layer
- 1
- Largest layer
- 39
- Area sq km
- 1,256
- Features per sq km
- 0.18475
- UWTROC Underwater rock 39
- SBDARE Seabed area 37
- LNDARE Land area 34
- DEPCNT Depth contour 29
- WEDKLP 26
- DEPARE Depth area 22
- COALNE Coastline 12
- M_QUAL Data quality 7
- SOUNDG Sounding 5
- MAGVAR Magnetic variation 3
- M_NPUB 2
- SEAARE Sea area 2
- ADMARE 1
- BUISGL 1
- CONZNE 1
- EXEZNE 1
- LNDELV 1
- LNDRGN Land region 1
- M_COVR Coverage 1
- M_NSYS 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/US4AK4CA.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AK4CA/1.0/US4AK4CA.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK4CA/1.0/US4AK4CA.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK4CA/1.0/US4AK4CA.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK4CA/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Jan 19, 2024 | metadata.json |