Do you go through customs when returning to your country if you never entered any others (by sea)?

For example, if I as a Canadian took a sail boat with infinite supplies, left Halifax, NS and did a giant loop of the Atlantic Ocean never getting within 200 NM of any other country (thereby leaving both territorial waters and the exclusive economic zone), do I have to report to Canada Border Services Agency upon returning to Canada?
Best Answer
To add to the answer above:
Yes, you would as the Customs have no means to verify this. But even if they were sure you're telling the truth, they would still need you to go through procedures:
To ensure that you are still eligible to reenter Canada after leaving. Even citizens sometimes are stripped of citizenship by the court orders;
To ensure that everyone on your vessel is an eligible for entering Canada. Even if you left alone, you might for example have rescued someone at sea - which is your duty as captain;
To ensure that you did not bring in any contraband, and to charge proper duty on dutiable goods which you have acquired from other vessels at sea (in international waters) or salvaged from the sea (such as treasure you retrieved from a sunk ship);
To ensure that you are not bringing animal/marine products from your own hunting/fishing activities;
To ensure that your travel purpose was lawful, and you were not for example participating in activities which are considered a crime in Canada (for example piracy in international waters).
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Do I have to go through customs?
Many wonder, \u201cdo I have to go through customs for a connecting flight?\u201d This is a common question amongst international travelers, and the answer is usually \u201cno.\u201d As long as you're not leaving the airport, your bags are checked through to your final destination and you have a boarding pass for your next flight, you won ...Do you go through customs at your final destination?
Travelers must clear U.S. Customs and Border Protection (CBP) at the first port of entry, if the final destination is in the United States. At U.S. ports of entry CBP officers or employees are assigned to clear travelers, collect duties, and enforce U.S. import and export laws and regulations.Do you have to go through customs to leave the US?
Generally speaking, you only clear customs if you're leaving the airport and entering into the country, not heading on to connecting flights.What has to be declared at customs?
You must declare all items you purchased and are carrying with you upon return to the United States, including gifts for other people as well as items you bought for yourself. This includes duty-free items purchased in foreign countries, as well as any merchandise you intend to sell or use in your business.These Countries will DENY ENTRY at Immigration. Vacation Disasters
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Answer 2
Not in the UK. If you don't land in another country, you don't fly a Q flag and clear customs. They could still board and ask where you've been, but yachtsman sail offshore all the time without clearing customs. (There are several races, such as the Fastnet, which round marks offshore and return to the UK without stopping).
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