Posted February 20th, 2013, 12:51 PM
I calculated that Johnstone strait is about 200 miles by the passage from Vancouver. The ship arrives in Vancouver at 7:30am and at 20-25 knots speed i'm guessing it will be in Johnstone strait 10 hours or so prior or perhaps even earlier so should be during daylight hours.
Your assumption is faulty and too simplistic. Routes and times can and do vary significantly. What will dictate more than anything will be Seymour Narrows. It is far more complicated than just "figuring" out distance and knots.
My range of ship differences has been to have been all the way back seeing the lights of Vancouver in the distance during dinner to being dark passing Port Hardy.
I know many landmarks, which allows me good judgement on what I want to see, and I also, don't hesistate to send messages to the bridge. Especially important, get friendly with the ship naturalist, and tune into the multiple, well informed repeaters.
Happy Alaska travels