The US does not issue "Captain's Licenses" or "Skipper's Licences", though those terms are sometimes used informally. Rather it issues licenses to individuals as "Masters" and "Operators of Un-Inspected Vessels". Both require a combination of "sea-time" and passing an exam. There are various endorsements to each which restrict the vessels an individual's license is applicable to.
Not trying to be arrogant, but you asked question because you did not have the knowledge, and now you suddenly brimming with it. And it is still wrong. As I said consult your Port Authorities to see what license applies to you. And yes, they DO call them skippers and captains too. They must. It is not an option. Master title applies to vessels to 100 tons. Captain is for everything above that. In accordance with local rules.
In the US the term "captain" is generally used for a person in command of a vessel and does not depend on holding a particular license. I'm not aware of it having any legal significance.
As, above. Wrong. Get informed before correcting someone who is making an effort to give you an answer. As for the legal significance, I was not referring to the usa, I was talking in general. There's more tho the world than just usa. The world operates on international maritime rules that apply to usa too, so a certain level of compatibility exist regardless of what you may have found on internet and misunderstood it along the way.
This is not true for many countries. For example there is no requirement for any type of license to leave the territorial waters of the US in a leisure vessel. Requirements for entering the territorial waters of another country are a different question. For example I can visit Canada in my boat and do not need a license or operator's certificate for short visits.
As above. Wrong again. You will notice that I said in many countries, not in every country. That indicates that there will be countries that are not signatories to those maritime laws, or are not implementing them when they should if they are signatories.
Every country signatory to a variety of international maritime rules must comply with those international agreements. While, being the chaos that usa is, I strongly doubt it that un-certified skipper would be let to sail into Canada. There may be bilateral agreements in place between Canada and usa that may allow that, but that would have to apply only to boats that would sail within a defined corridor between the two countries.You would have to be issued a fine in Canada, or any other country for that matter, if you had your boat not insured and sailed it without the certificate as a skipper, from outside of such a corridor. That in practice you may get away with it, that's another story. But, again, I doubt it. You must hold a valid certificate (license un usa...) to be allowed to operate a vessel at sea.
If you ixquick (secure search engine) it you will find that even in the usa the international rule of the distance from the shore applies to skipper/master/captain (notice the order. that is the true hierarchy of those boat-managing positions) certificates. You will find that you may get away with it not because usa "allows" it but because the Canada and the usa accept each other's categories of certificates for skippers. As long as you comply with the distance from the shore that is valid in respective countries and keep the legal minimum of passengers (again: according to respective country's, laws) you may be let off.
The same would apply to insurance. If Canada accepts your vessel un-insured, you will be fine. But, again, I doubt it. You would be slapped with a hefty fine even in Canada, if they follow the law there.
Remember, for authoritative info you must ask the Port Authorities in your country. Only they can tell you what you can do and where.
But no country in the world will let you operate a 1180 tons ship with a crew of volunteers. You must have a radio operator, a machine crew, a SOLAS-compliant equipment, an insurance for the vessel and the crew, etc. etc. etc. etc. Everything and everyone MUST be certified for their duty/function on board. I doubt you'd be allowed to leave the berth with your family, friends or anonimous volunteers as a crew, and no certificates. The world doesn't work that way. Only Hollywood movies do.