NOAA S-57 chart cell
Rat Islands, AK
US4AK1BY
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 1,384
- S-57 layers
- 31
- Published
- Apr 12, 2024
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 51.60000° N
- South
- 51.30000° N
- West
- 178.80000° E
- East
- 179.40000° E
- Center
- 51.45000° N, 179.10000° E
- Bounds area
- 404 sq nm
- Feature density
- 3.4225 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 44.6
- Smallest layer
- 1
- Largest layer
- 314
- Area sq km
- 1,387
- Features per sq km
- 0.99785
- UWTROC Underwater rock 314
- DEPCNT Depth contour 287
- DEPARE Depth area 236
- RIVERS River 139
- SBDARE Seabed area 134
- OBSTRN Obstruction 90
- COALNE Coastline 53
- LNDARE Land area 36
- LNDRGN Land region 15
- SEAARE Sea area 15
- LNDELV 14
- WEDKLP 9
- M_QUAL Data quality 7
- LAKARE 4
- LNDMRK 4
- SLCONS Shoreline construction 4
- RUNWAY 3
- SOUNDG Sounding 3
- ADMARE 2
- MAGVAR Magnetic variation 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/US4AK1BY.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AK1BY/1.0/US4AK1BY.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK1BY/1.0/US4AK1BY.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK1BY/1.0/US4AK1BY.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK1BY/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Apr 12, 2024 | metadata.json |