I also have Larry Robinson's PNW Ferries and BC Ferries for Pacific Northwest and Pacific Fjords scenery. These are third party addons, you can most likely find on Avsim or Simviation, etc. Search for Ferries.
LR_PNW_ferries_complete.zip
bc_ferries_scenery.zip
PNW AI ferries and terminals.zip
LR_PNW_ferries.zip
... unless you're thinking of the cruise ships or tankers and container ships. They can also be added. There's the RTMM and TFX shipping projects, etc.