| NOS/NIMA | |
|---|---|
 |
Highway markers |
 |
Railway (Ry), single or double track; Railroad (RR) |
 |
Abandoned railroad |
 |
Bridge under construction |
 |
Footbridge |
 |
Viaduct |
 |
Fence |
 |
Power transmission line |
| NOS | National Ocean Service (US) |
| NIMA | National Imagery and Mapping Agency (US) |
| IHO | International Hydrographic Organization |
|
|
||||||||||||||||||
|
|||||||||||||||||||
|
|
||||||||||||||||||