NOAA S-57 chart cell
Federated States of Micronesia - Approaches to Ngulu Atoll
US4TB4S0
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 1,681
- S-57 layers
- 22
- Published
- Oct 2, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 9.00000° N
- South
- 8.00000° N
- West
- 137.00000° E
- East
- 138.00000° E
- Center
- 8.50000° N, 137.50000° E
- Bounds area
- 3,565 sq nm
- Feature density
- 0.4715 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 76.4
- Smallest layer
- 1
- Largest layer
- 522
- Area sq km
- 12,228
- Features per sq km
- 0.13747
- SBDARE Seabed area 522
- DEPCNT Depth contour 447
- DEPARE Depth area 412
- UWTROC Underwater rock 59
- M_QUAL Data quality 50
- SWPARE 37
- OBSTRN Obstruction 35
- TS_FEB 33
- LNDARE Land area 30
- SEAARE Sea area 15
- COALNE Coastline 12
- ADMARE 11
- VEGATN 6
- LNDELV 2
- M_COVR Coverage 2
- SOUNDG Sounding 2
- BUAARE 1
- BUISGL 1
- M_NPUB 1
- M_NSYS 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/US4TB4S0.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4TB4S0/1.0/US4TB4S0.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4TB4S0/1.0/US4TB4S0.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4TB4S0/1.0/US4TB4S0.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4TB4S0/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Oct 2, 2025 | metadata.json |