The GWC is advocating for ports, industry and retail to join this movement on a voluntary basis by issuing approach and departure routing advisories that, while placing vessel safety first, absorb real-time data from local biologists and observers to formulate guidelines that are forwarded to vessels as part of their arrival and departure communications package. The authorities of these entities are  tasked to minimize additional time and distance impositions for transiting vessels, thus reducing the financial costs to the shipping industry. In collaboration with GWC each port draws up its own proposals and written guidelines that also include recommended vectors; accompanied by maps, mariners would use this information to avoid collisions with whales.