NOAA S-57 chart cell
Rat Islands, AK
US4AK1ET
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 104
- S-57 layers
- 22
- Published
- Apr 12, 2024
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 52.50000° N
- South
- 52.20000° N
- West
- 175.80000° E
- East
- 176.40000° E
- Center
- 52.35000° N, 176.10000° E
- Bounds area
- 396 sq nm
- Feature density
- 0.2624 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 4.7
- Smallest layer
- 1
- Largest layer
- 21
- Area sq km
- 1,359
- Features per sq km
- 0.0765
- DEPARE Depth area 21
- DEPCNT Depth contour 20
- LNDARE Land area 18
- LNDELV 7
- WEDKLP 7
- COALNE Coastline 4
- LNDRGN Land region 4
- OBSTRN Obstruction 4
- M_NPUB 2
- M_QUAL Data quality 2
- MAGVAR Magnetic variation 2
- SEAARE Sea area 2
- SOUNDG Sounding 2
- ADMARE 1
- CONZNE 1
- EXEZNE 1
- M_COVR Coverage 1
- M_NSYS 1
- RESARE 1
- SLOGRD 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/US4AK1ET.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AK1ET/1.0/US4AK1ET.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK1ET/1.0/US4AK1ET.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK1ET/1.0/US4AK1ET.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK1ET/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Apr 12, 2024 | metadata.json |