Remember, once they vet everybody and load all the tons of supplies they need to bring (helpfully described in detail by John P. Capitalist above), it's still more than 2,000 miles to the northern Atlantic from the Great Lakes, depending on where you start. On an armada the size of this one, it'll take WEEKS to get to any place pleasant in the Atlantic. By then, the millions of people who are dying like flies from the vaxtermination will be getting insanely panicky, and they'll try to stop Krap'n Karl and his merry armada before they can even reach the Atlantic!
I know I will, anyway. My Mighty Mighty Fogbow Galactic Special Forces Combat Ranger Seals will be strategically placed along the St. Lawrence Seaway, lying in wait with special Armada Torpedoes.
They shall not pass!
![Boxing :boxing:](./images/smilies/boxing.gif)