aren't you supposed to be legal resident in the country where you're applying for your visa...

Isn't that a crime?

I found a copy of Giant Steps in a European bookshop circa 2008, so he was never an obscure figure. In any event, within the overland travel community especially, Bushby comes up occasionally for his walking across the Darien Gap (a region which is the bane of people traveling up or down the Americas), as well as for his Bering Strait crossing.

I think the commenter was referring to visa sponsorship. Visa sponsorship is a bit more involved than just money. Someone is putting their name on government paperwork saying that if something goes wrong with this visitor, all bills can be forwarded to me. It isn't like a goFundMe or Kickstarter where a whole bunch of people are chipping in on a person or project; it is one person putting their livelihood on the line to vouch for that visitor's trustworthiness. And if the country requires sponsorship for their visa program, and no one is willing (or if you don't know a single person in that country), you cannot enter.

https://duckduckgo.com/?t=ffab&q=visa+sponsorship+meaning&ia...

The article says he would “decamp” to Mexico at times and then pick up where he had left off. I read this as he’d take a break and fly (presumably) to Mexico and then fly back to where he left off.

Depends on what you mean by “unbroken”.

I’d assume that when he ran into legal issues like after crossing the Bering Strait the authorities would transport him via a car or bus so it’s not like he never took a motorized transport.

People always assume he's been walking continuously for all these years, and it's understandable because the headlines are always written to imply that.

He doesn't. He walks some, marks where he stopped, takes a break, continues from where he left off.