NOAA S-57 chart cell
Semidi Islands and Vicinity
US4AK3PY
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 205
- S-57 layers
- 18
- Published
- Oct 2, 2023
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 56.40000° N
- South
- 56.10000° N
- West
- 157.20000° W
- East
- 156.60000° W
- Center
- 56.25000° N, 156.90000° W
- Bounds area
- 360 sq nm
- Feature density
- 0.5687 / sq nm
Chart Statistics
18 largest layers shown
- Average features per layer
- 11.4
- Smallest layer
- 1
- Largest layer
- 71
- Area sq km
- 1,236
- Features per sq km
- 0.1658
- DEPCNT Depth contour 71
- DEPARE Depth area 69
- UWTROC Underwater rock 14
- COALNE Coastline 10
- LNDARE Land area 10
- SBDARE Seabed area 10
- M_QUAL Data quality 6
- LNDELV 3
- MAGVAR Magnetic variation 3
- ADMARE 1
- CBLSUB 1
- CONZNE 1
- EXEZNE 1
- M_COVR Coverage 1
- M_NPUB 1
- M_NSYS 1
- SEAARE Sea area 1
- SOUNDG Sounding 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/US4AK3PY.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AK3PY/1.0/US4AK3PY.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK3PY/1.0/US4AK3PY.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK3PY/1.0/US4AK3PY.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK3PY/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Oct 2, 2023 | metadata.json |