NOAA S-57 chart cell
Amukta Pass to Unalaska Island, AK
US4AK3FF
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 1,498
- S-57 layers
- 29
- Published
- Apr 14, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 53.40000° N
- South
- 53.10000° N
- West
- 168.60000° W
- East
- 168.00000° W
- Center
- 53.25000° N, 168.30000° W
- Bounds area
- 388 sq nm
- Feature density
- 3.8585 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 51.7
- Smallest layer
- 1
- Largest layer
- 391
- Area sq km
- 1,332
- Features per sq km
- 1.12495
- UWTROC Underwater rock 391
- LNDARE Land area 356
- SBDARE Seabed area 143
- COALNE Coastline 110
- DEPCNT Depth contour 109
- DEPARE Depth area 105
- WEDKLP 105
- RIVERS River 58
- SLOTOP 36
- LNDELV 33
- SEAARE Sea area 10
- LNDRGN Land region 7
- SOUNDG Sounding 5
- OBSTRN Obstruction 4
- LAKARE 3
- M_QUAL Data quality 3
- MAGVAR Magnetic variation 3
- ADMARE 2
- ICEARE 2
- M_NPUB 2
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/US4AK3FF.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AK3FF/1.0/US4AK3FF.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK3FF/1.0/US4AK3FF.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK3FF/1.0/US4AK3FF.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK3FF/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Apr 14, 2025 | metadata.json |