NOAA S-57 chart cell
Alaska
US4AK7JT
- Usage band
- Approach · code 4
- Current edition
- 3.0
- Features
- 656
- S-57 layers
- 29
- Published
- May 22, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 70.20000° N
- South
- 69.90000° N
- West
- 146.40000° W
- East
- 145.20000° W
- Center
- 70.05000° N, 145.80000° W
- Bounds area
- 443 sq nm
- Feature density
- 1.4815 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 22.6
- Smallest layer
- 1
- Largest layer
- 142
- Area sq km
- 1,519
- Features per sq km
- 0.43194
- COALNE Coastline 142
- LAKARE 89
- UWTROC Underwater rock 80
- RIVERS River 75
- DEPCNT Depth contour 45
- OBSTRN Obstruction 41
- DEPARE Depth area 40
- LNDARE Land area 36
- LNDRGN Land region 29
- SBDARE Seabed area 21
- WATTUR 11
- CTNARE Caution area 10
- M_QUAL Data quality 10
- SOUNDG Sounding 5
- BCNSPP Special purpose beacon 3
- SEAARE Sea area 3
- AIRARE 2
- SLOGRD 2
- SLOTOP 2
- ACHARE Anchorage area 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/US4AK7JT.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AK7JT/3.0/US4AK7JT.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK7JT/3.0/US4AK7JT.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK7JT/3.0/US4AK7JT.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK7JT/3.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 3.0 | May 22, 2026 | metadata.json |