NOAA S-57 chart cell
Gulf of Alaska - approaches to Cook Inlet
US4AK4MH
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 46
- S-57 layers
- 14
- Published
- Jul 1, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 58.80000° N
- South
- 58.50000° N
- West
- 151.80000° W
- East
- 151.20000° W
- Center
- 58.65000° N, 151.50000° W
- Bounds area
- 338 sq nm
- Feature density
- 0.1363 / sq nm
Chart Statistics
14 largest layers shown
- Average features per layer
- 3.3
- Smallest layer
- 1
- Largest layer
- 21
- Area sq km
- 1,158
- Features per sq km
- 0.03973
- SBDARE Seabed area 21
- SOUNDG Sounding 5
- DEPARE Depth area 3
- MAGVAR Magnetic variation 3
- CBLSUB 2
- DEPCNT Depth contour 2
- M_QUAL Data quality 2
- TESARE 2
- CONZNE 1
- EXEZNE 1
- M_COVR Coverage 1
- M_NPUB 1
- M_NSYS 1
- SEAARE Sea 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/US4AK4MH.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AK4MH/1.0/US4AK4MH.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK4MH/1.0/US4AK4MH.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK4MH/1.0/US4AK4MH.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK4MH/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Jul 1, 2025 | metadata.json |