NOAA S-57 chart cell
Alaska
US4AK7OK
- Usage band
- Approach · code 4
- Current edition
- 2.0
- Features
- 92
- S-57 layers
- 18
- Published
- Jun 18, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 71.70000° N
- South
- 71.40000° N
- West
- 157.20000° W
- East
- 156.00000° W
- Center
- 71.55000° N, 156.60000° W
- Bounds area
- 411 sq nm
- Feature density
- 0.224 / sq nm
Chart Statistics
18 largest layers shown
- Average features per layer
- 5.1
- Smallest layer
- 1
- Largest layer
- 30
- Area sq km
- 1,409
- Features per sq km
- 0.06531
- DEPARE Depth area 30
- DEPCNT Depth contour 30
- SOUNDG Sounding 8
- M_QUAL Data quality 5
- CBLSUB 2
- M_NPUB 2
- MAGVAR Magnetic variation 2
- SBDARE Seabed area 2
- SEAARE Sea area 2
- ADMARE 1
- BOYSPP Special purpose buoy 1
- CONZNE 1
- COSARE 1
- CTNARE Caution area 1
- EXEZNE 1
- M_COVR Coverage 1
- M_NSYS 1
- TESARE 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/US4AK7OK.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AK7OK/2.0/US4AK7OK.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK7OK/2.0/US4AK7OK.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK7OK/2.0/US4AK7OK.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK7OK/2.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 2.0 | Jun 18, 2026 | metadata.json |