NOAA S-57 chart cell

Approaches to Ossabaw Sound

US4GA1DG

Usage band
Approach · code 4
Current edition
3.1
Features
2,262
S-57 layers
46
Published
Nov 12, 2025
Manifest updated
Jun 22, 2026, 2:51 PM UTC

Coverage

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North
32.10000° N
South
31.80000° N
West
81.30000° W
East
81.00000° W
Center
31.95000° N, 81.15000° W
Bounds area
275 sq nm
Feature density
8.2168 / sq nm

Chart Statistics

20 largest layers shown

Average features per layer
49.2
Smallest layer
1
Largest layer
420
Area sq km
944
Features per sq km
2.39564
  1. COALNE Coastline 420
  2. DEPARE Depth area 301
  3. DEPCNT Depth contour 284
  4. LNDRGN Land region 213
  5. RIVERS River 212
  6. LNDARE Land area 135
  7. DAYMAR 99
  8. BCNLAT Lateral beacon 98
  9. RETRFL 75
  10. SEAARE Sea area 64
  11. LIGHTS Light 60
  12. SLCONS Shoreline construction 44
  13. M_QUAL Data quality 40
  14. CTNARE Caution area 22
  15. SBDARE Seabed area 22
  16. BRIDGE 21
  17. BUAARE 21
  18. BCNSPP Special purpose beacon 20
  19. CBLOHD 16
  20. SOUNDG Sounding 14

Nearby Chart Cells

Approach usage band

  1. Nedway River to Jerico River US4GA1DF - about 15 nm away
  2. Approaches to Calibogue Sound, Savannah River, and Wassaw Sound US4GA1DH - about 15 nm away
  3. Approaches to Saint Catherines Sound and Sapelo Sound US4GA1CG - about 18 nm away
  4. Port Royal Sound to Broad River and Calibogue Sound US4SC1AL - about 24 nm away
  5. South Hampton Creek and Sapelo River US4GA1CF - about 24 nm away
  6. Approaches to Ossabaw Sound - North Atlantic Ocean US4GA1CH - about 24 nm away

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.

Editions

Edition Published Metadata
3.1 Nov 12, 2025 metadata.json