Related Clues:
- Atlantic route
- Main road?
- Marine shipping lane
- Ship's navigational route
- Prevailing winds help determine one
- Lane in the ocean
- Pirate's hunting ground
- Ship's route
- St. Lawrence, for one
- Chap brought in to observe marine passage
- Channel open to ships
- Main road on which tramps may be seen
- Ships' route
- For starters, scrambled egg's off: here's main course
- Route for shipping