NOAA S-57 chart cell
Semidi Islands - South
US4AK3OY
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 272
- S-57 layers
- 17
- Published
- Oct 2, 2023
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 56.10000° N
- South
- 55.80000° N
- West
- 157.20000° W
- East
- 156.60000° W
- Center
- 55.95000° N, 156.90000° W
- Bounds area
- 363 sq nm
- Feature density
- 0.7487 / sq nm
Chart Statistics
17 largest layers shown
- Average features per layer
- 16
- Smallest layer
- 1
- Largest layer
- 98
- Area sq km
- 1,246
- Features per sq km
- 0.21827
- DEPCNT Depth contour 98
- DEPARE Depth area 90
- UWTROC Underwater rock 22
- COALNE Coastline 18
- LNDARE Land area 18
- LNDELV 9
- M_QUAL Data quality 5
- ADMARE 2
- MAGVAR Magnetic variation 2
- CONZNE 1
- EXEZNE 1
- M_COVR Coverage 1
- M_NPUB 1
- M_NSYS 1
- SEAARE Sea area 1
- SOUNDG Sounding 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/US4AK3OY.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AK3OY/1.0/US4AK3OY.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK3OY/1.0/US4AK3OY.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK3OY/1.0/US4AK3OY.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK3OY/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Oct 2, 2023 | metadata.json |