NOAA S-57 chart cell
Approaches to Ossabaw Sound - North Atlantic Ocean
US4GA1CH
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 197
- S-57 layers
- 20
- Published
- Mar 24, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 31.80000° N
- South
- 31.50000° N
- West
- 81.00000° W
- East
- 80.70000° W
- Center
- 31.65000° N, 80.85000° W
- Bounds area
- 276 sq nm
- Feature density
- 0.7133 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 9.9
- Smallest layer
- 1
- Largest layer
- 79
- Area sq km
- 947
- Features per sq km
- 0.20796
- SBDARE Seabed area 79
- DEPARE Depth area 42
- DEPCNT Depth contour 39
- SOUNDG Sounding 8
- M_QUAL Data quality 7
- OBSTRN Obstruction 6
- RESARE 2
- SEAARE Sea area 2
- ADMARE 1
- BOYLAT Lateral buoy 1
- BOYSAW 1
- CONZNE 1
- EXEZNE 1
- LIGHTS Light 1
- M_COVR Coverage 1
- M_NPUB 1
- M_NSYS 1
- MAGVAR Magnetic variation 1
- TESARE 1
- TOPMAR 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/US4GA1CH.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4GA1CH/1.0/US4GA1CH.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4GA1CH/1.0/US4GA1CH.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4GA1CH/1.0/US4GA1CH.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4GA1CH/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Mar 24, 2025 | metadata.json |