cherod
N/A
certainly ,,, but they may not be easy to see at first with just the cursory glance behind ( lookout ) . i think were it me even if not under power at the time , which i think would be most likely when in passage , if i saw them approaching i would, or even saw them at tall , at least have the engines on toute sweet .Your right in saying their are unannounced but in day light at times you will see them in the distance, now I'm not saying every time we see Orca we should go in astern but along that part of coast line , it's a consideration.
May not be for everyone but I would if I happen to be under motor at the time.
Probably we won't hear much over the coming months until the route is heavy used again in spring.