NOAA S-57 chart cell
Clarence Strait, Nichols Passage, Revillagigedo Channel, and Tongass Narrows
US4AK5HO
- Usage band
- Approach · code 4
- Current edition
- 2.0
- Features
- 5,265
- S-57 layers
- 56
- Published
- Feb 19, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 55.50000° N
- South
- 55.20000° N
- West
- 132.00000° W
- East
- 131.40000° W
- Center
- 55.35000° N, 131.70000° W
- Bounds area
- 369 sq nm
- Feature density
- 14.2712 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 94
- Smallest layer
- 1
- Largest layer
- 1,198
- Area sq km
- 1,265
- Features per sq km
- 4.16081
- SBDARE Seabed area 1,198
- DEPCNT Depth contour 909
- DEPARE Depth area 861
- UWTROC Underwater rock 350
- BUISGL 276
- SLCONS Shoreline construction 268
- COALNE Coastline 243
- LNDARE Land area 173
- RIVERS River 135
- PILPNT 117
- PONTON 89
- WEDKLP 85
- MORFAC 57
- OBSTRN Obstruction 55
- LNDELV 49
- LIGHTS Light 45
- LNDRGN Land region 45
- SEAARE Sea area 45
- M_QUAL Data quality 35
- DAYMAR 30
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/US4AK5HO.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4AK5HO/2.0/US4AK5HO.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4AK5HO/2.0/US4AK5HO.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4AK5HO/2.0/US4AK5HO.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4AK5HO/2.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 2.0 | Feb 19, 2026 | metadata.json |