NOAA S-57 chart cell
Gulf of Alaska and Sitkinak Strait
US4AK4FD
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 880
- S-57 layers
- 33
- Published
- Aug 4, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 56.70000° N
- South
- 56.40000° N
- West
- 154.20000° W
- East
- 153.60000° W
- Center
- 56.55000° N, 153.90000° W
- Bounds area
- 358 sq nm
- Feature density
- 2.4604 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 26.7
- Smallest layer
- 1
- Largest layer
- 209
- Area sq km
- 1,227
- Features per sq km
- 0.71734
- WEDKLP 209
- UWTROC Underwater rock 146
- DEPCNT Depth contour 112
- DEPARE Depth area 106
- SBDARE Seabed area 90
- RIVERS River 59
- LNDARE Land area 34
- COALNE Coastline 23
- LNDELV 20
- WATTUR 15
- SOUNDG Sounding 13
- OBSTRN Obstruction 11
- LAKARE 6
- M_QUAL Data quality 6
- LNDRGN Land region 5
- BUISGL 3
- SEAARE Sea area 3
- SLOGRD 3
- MAGVAR Magnetic variation 2
- ADMARE 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/US4AK4FD.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AK4FD/1.0/US4AK4FD.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK4FD/1.0/US4AK4FD.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK4FD/1.0/US4AK4FD.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK4FD/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Aug 4, 2025 | metadata.json |