NOAA S-57 chart cell

Approaches to Chesapeake Bay

US4VA1AI

Usage band
Approach · code 4
Current edition
1.16
Features
161
S-57 layers
19
Published
Apr 10, 2026
Manifest updated
Jun 22, 2026, 2:51 PM UTC

Coverage

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North
36.90000° N
South
36.60000° N
West
75.30000° W
East
75.00000° W
Center
36.75000° N, 75.15000° W
Bounds area
260 sq nm
Feature density
0.6193 / sq nm

Chart Statistics

19 largest layers shown

Average features per layer
8.5
Smallest layer
1
Largest layer
34
Area sq km
892
Features per sq km
0.18057
  1. SBDARE Seabed area 34
  2. LIGHTS Light 28
  3. LNDARE Land area 28
  4. LNDMRK 28
  5. SOUNDG Sounding 11
  6. M_QUAL Data quality 6
  7. OBSTRN Obstruction 4
  8. CBLSUB 3
  9. DEPARE Depth area 3
  10. CTNARE Caution area 2
  11. DEPCNT Depth contour 2
  12. DMPGRD 2
  13. M_NPUB 2
  14. MAGVAR Magnetic variation 2
  15. SEAARE Sea area 2
  16. COSARE 1
  17. EXEZNE 1
  18. M_COVR Coverage 1
  19. M_NSYS 1

Nearby Chart Cells

Approach usage band

  1. Approaches to Chesapeake Bay US4VA1AH - about 14 nm away
  2. Approaches to Chesapeake Bay US4VA1AJ - about 14 nm away
  3. Approaches to Chesapeake Bay US4VA1BI - about 18 nm away
  4. Approaches to Chesapeake Bay US4VA1BH - about 23 nm away
  5. Approaches to Chesapeake Bay US4VA1BJ - about 23 nm away
  6. Approaches to Chesapeake Bay US4VA1AG - about 29 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
1.16 Apr 10, 2026 metadata.json