NOAA S-57 chart cell
Norton Sound, Alaska
US4AK6NU
- Usage band
- Approach · code 4
- Current edition
- 1.1
- Features
- 176
- S-57 layers
- 24
- Published
- Sep 5, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 63.60000° N
- South
- 63.30000° N
- West
- 162.00000° W
- East
- 161.40000° W
- Center
- 63.45000° N, 161.70000° W
- Bounds area
- 290 sq nm
- Feature density
- 0.6068 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 7.3
- Smallest layer
- 1
- Largest layer
- 27
- Area sq km
- 995
- Features per sq km
- 0.17692
- UWTROC Underwater rock 27
- SBDARE Seabed area 26
- DEPCNT Depth contour 18
- LNDARE Land area 17
- COALNE Coastline 16
- DEPARE Depth area 16
- SLOGRD 12
- M_QUAL Data quality 10
- LNDELV 5
- SOUNDG Sounding 5
- RIVERS River 4
- SEAARE Sea area 4
- ADMARE 2
- BUAARE 2
- LNDRGN Land region 2
- TESARE 2
- BCNSPP Special purpose beacon 1
- DAYMAR 1
- LIGHTS Light 1
- M_COVR Coverage 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/US4AK6NU.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4AK6NU/1.1/US4AK6NU.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4AK6NU/1.1/US4AK6NU.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK6NU/1.1/US4AK6NU.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK6NU/1.1/US4AK6NU.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK6NU/1.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.1 | Sep 5, 2025 | metadata.json |