Perk of Perseas Dive, Powell River
Regrettably, I didn't note the time or have GPS access, but perhaps the ferry's log would show that info. I think the ship was the Queen of Coquitlam, and that it was the second officer who announced the sighting to the passengers. This occurred more or less in the middle of the Strait, but perhaps the log will have the coordinates.
Just one thing worried me: I know that dolphins are very smart - but, since they were crossing the ferry's path, could any of them have been injured? I saw one leap out of the water very close to the bow of the ship, at a 90 degree angle to the ship's direction of travel, heading toward the ship. I wasn't able to see what happened after that, but I hope that the bow wave carried the dolphin back alongside the ship.