IDOS is the "bible" for public transport, working for every bus and train in the country.
: "Portable" suggests a mobile unit. It could refer to a specific piece of Czech-made cold-war era telecommunications or SIGINT (Signals Intelligence) equipment, such as those produced by (the Czechoslovak state company). Aviation Slang : The term "Bitch" is famously used for the "Bitchin' Betty"
: Popular tools for navigating the Czech lifestyle include mapy.cz for offline travel and idos.cz for public transit.