NOAA S-57 chart cell
Palau - Tobi South and Helen Reef
US4TB1L0
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 809
- S-57 layers
- 22
- Published
- Apr 16, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 3.00000° N
- South
- 2.00000° N
- West
- 131.00000° E
- East
- 132.00000° E
- Center
- 2.50000° N, 131.50000° E
- Bounds area
- 3,601 sq nm
- Feature density
- 0.2246 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 36.8
- Smallest layer
- 1
- Largest layer
- 319
- Area sq km
- 12,352
- Features per sq km
- 0.06549
- SBDARE Seabed area 319
- DEPARE Depth area 244
- DEPCNT Depth contour 165
- LNDARE Land area 17
- M_QUAL Data quality 14
- ADMARE 7
- COALNE Coastline 7
- SOUNDG Sounding 7
- UWTROC Underwater rock 5
- M_COVR Coverage 3
- SEAARE Sea area 3
- WRECKS Wreck 3
- M_NPUB 2
- M_NSYS 2
- MAGVAR Magnetic variation 2
- TS_FEB 2
- UNSARE 2
- CURENT 1
- LNDELV 1
- M_CSCL 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/US4TB1L0.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4TB1L0/1.0/US4TB1L0.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4TB1L0/1.0/US4TB1L0.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4TB1L0/1.0/US4TB1L0.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4TB1L0/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Apr 16, 2025 | metadata.json |