| NOS/NIMA | IHO | Foreign NIMA Charts | |
|---|---|---|---|
 |
Contour lines with spot height |
 |
 |
 |
Spot heights |
 |
|
 |
Approximate contour lines with approximate height |
 |
|
 |
Form lines with spot height |
 |
|
 |
Approximate height of top of trees (above height datum) |
 |
|