@celesteh there's a story about a group of geeks from Mendoza traveling to Buenos Aires in two cars. Don't remember the year, but it must have been late late 90s/early early 00s. Cell data was _expensive_, including the roaming they charged when you crossed provincial lines. So they setup an AP in one of the cars and I think it was either an IRC or XMMP server and used that to coordinate.

Edit: forgot to mention: that was a 1k km (1Mm!) trip.