NOAA S-57 chart cell
Tugidak Island; Sitkinak Island
US4AK4FC
- Usage band
- Approach · code 4
- Current edition
- 2.0
- Features
- 470
- S-57 layers
- 24
- Published
- Jun 15, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 56.70000° N
- South
- 56.40000° N
- West
- 154.80000° W
- East
- 154.20000° W
- Center
- 56.55000° N, 154.50000° W
- Bounds area
- 358 sq nm
- Feature density
- 1.3141 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 19.6
- Smallest layer
- 1
- Largest layer
- 84
- Area sq km
- 1,227
- Features per sq km
- 0.38312
- DEPARE Depth area 84
- DEPCNT Depth contour 82
- UWTROC Underwater rock 82
- COALNE Coastline 53
- SBDARE Seabed area 52
- LNDRGN Land region 25
- RIVERS River 16
- LAKARE 10
- WEDKLP 10
- LNDARE Land area 9
- LNDELV 9
- SOUNDG Sounding 7
- OBSTRN Obstruction 6
- M_QUAL Data quality 5
- WATTUR 5
- MAGVAR Magnetic variation 3
- SEAARE Sea area 3
- ADMARE 2
- BUISGL 2
- CTNARE Caution area 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/US4AK4FC.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AK4FC/2.0/US4AK4FC.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK4FC/2.0/US4AK4FC.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK4FC/2.0/US4AK4FC.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK4FC/2.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 2.0 | Jun 15, 2026 | metadata.json |