arnaud ... I know this is an old thread.
but what I do before I go overseas - i make myself memorize a basic map of the country.
nothing fancy - just the general shape (outline) of the country, locations of a few major towns & cities, major landmarks (mountains, rivers, coast), and a few of the principle highways. i also think through a few basic escape routes or exit points - where are the borders, which ones would be easier to cross. etc.
it's a bit of work to do this ... but worthwhile.
that way your E&E kit is in your head.
good luck,
KL