| NOS | NIMA | |
IHO/Foreign NIMA Charts |
|---|---|---|---|
 |
Recommended track for deep draft vessels (track not defined by fixed marks) | ||
 |
Depth is shown where it has been obtained by the cognizant authority | ||
 |
Alternate course | ||
 |
Established traffic separation scheme: Roundabout | ||
 |
If no separation zone exists, the center of the roundabout is shown by a circle | ||