NOAA S-57 chart cell
Alaska
US4AK4UN
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 1,227
- S-57 layers
- 22
- Published
- Nov 16, 2023
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 61.20000° N
- South
- 60.90000° N
- West
- 148.20000° W
- East
- 147.60000° W
- Center
- 61.05000° N, 147.90000° W
- Bounds area
- 314 sq nm
- Feature density
- 3.9066 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 55.8
- Smallest layer
- 1
- Largest layer
- 295
- Area sq km
- 1,077
- Features per sq km
- 1.13898
- UWTROC Underwater rock 295
- DEPARE Depth area 226
- DEPCNT Depth contour 219
- LNDARE Land area 123
- COALNE Coastline 113
- RIVERS River 64
- SBDARE Seabed area 51
- M_QUAL Data quality 34
- LNDELV 28
- SEAARE Sea area 26
- ICEARE 19
- LNDRGN Land region 7
- MAGVAR Magnetic variation 6
- SOUNDG Sounding 6
- OBSTRN Obstruction 2
- UNSARE 2
- BUAARE 1
- M_COVR Coverage 1
- M_NPUB 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/US4AK4UN.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AK4UN/1.0/US4AK4UN.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK4UN/1.0/US4AK4UN.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK4UN/1.0/US4AK4UN.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK4UN/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Nov 16, 2023 | metadata.json |