NOAA S-57 chart cell
Rat Islands, AK
US4AK1DW
- Usage band
- Approach · code 4
- Current edition
- 1.1
- Features
- 1,206
- S-57 layers
- 25
- Published
- Apr 1, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 52.20000° N
- South
- 51.90000° N
- West
- 177.60000° E
- East
- 178.20000° E
- Center
- 52.05000° N, 177.90000° E
- Bounds area
- 399 sq nm
- Feature density
- 3.0222 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 48.2
- Smallest layer
- 1
- Largest layer
- 421
- Area sq km
- 1,369
- Features per sq km
- 0.88115
- LNDARE Land area 421
- DEPCNT Depth contour 168
- DEPARE Depth area 163
- COALNE Coastline 113
- UWTROC Underwater rock 103
- SBDARE Seabed area 62
- OBSTRN Obstruction 46
- LNDRGN Land region 27
- RIVERS River 20
- SEAARE Sea area 16
- LNDELV 15
- WEDKLP 15
- WATTUR 11
- M_QUAL Data quality 5
- SOUNDG Sounding 5
- DMPGRD 4
- ADMARE 2
- MAGVAR Magnetic variation 2
- SLCONS Shoreline construction 2
- LNDMRK 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/US4AK1DW.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4AK1DW/1.1/US4AK1DW.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4AK1DW/1.1/US4AK1DW.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK1DW/1.1/US4AK1DW.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK1DW/1.1/US4AK1DW.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK1DW/1.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.1 | Apr 1, 2026 | metadata.json |