Related Clues:
- Route regularly used by commercial vessels
- Saint Lawrence ____
- Tanker's route
- Maritime shipping channel
- Man blocks view in main route
- Route for shipping vessels
- Course for a container ship
- -hipping rout-?
- Watery trade route
- Shipping route through the 8-Down
- Reportedly understand how to make main course?
- Inland passage
- Ocean passage