The Haro Strait orca whale pod of roughly 30 whales hang out in the waters between Sidney at the bottom end of Vancouver Island and the San Juan Islands. Next weekend, I am considering motoring from Sidney into Haro Strait in US waters, looking at the whales briefly with my 25-year old son (who has never seen a whale), and then motoring back into Canadian waters. Because I may enter US waters, not stop on land and then return to Canada, does this mean I have to go to the nearest US customs port and formally check in etc. I think I probably have to check in with both US and then Canadian customs on my return. Just wondering whether the Canadian whale-watching tour boats formally check-in. They do not seem to. Any US immigration experts out there. I do not want to have my boat seized.