Found the Sanborn's just a few blocks away, on the corner of Independencia and Lerdo. There's an unsecured wireless router, SSID "default", but for some reason I can't connect.
(Update after I left there)... across the street there's a little park or Zócalo where an unprotected Linksys signal comes in fairly well, from where I'm uploading this.
last updated 2013-01-10 21:08:05. served from tektonic.jcomeau.com