If you are going with BC Ferries, GET A DISCHARGE BOOK! Their little booklet is about as useful as toilet paper for counting qualifying service. Make sure you have the discharge book and a Testimonial of Sea Service completed before you leave the ship, even supposing you're on for just one trip lasting a few hours. GET THE DISCHARGE BOOK FILLED IN!
I had to threaten the CEO of BC Ferries with legal action to get the sea service of one guy who had been an ERR.
Discourage incest, ban country "music".