A big blue alien in a tropical beach town circa Revolutionary War... [That's around when tricorns were big from what he remembers of history. Not a subject he studied much, unless it was art history. Gotta know the provenance of a painting if you're deciding if it's worth stealing or not.]

Yeah, that should get the Waverider's attention.

[And if it doesn't, he'll keep sending up smoke signals. Maybe find somebody important to history and kidnap them. Hold Thomas Jefferson at gunpoint and force him to add a coded message to the Declaration of Independence.]