48/ Detour (Edgar J. Ulmer 1946)

‘The figure of the map returns: on the map are inscribed the names of these missing cities [New York and Los Angeles]; on the map is also drawn the wandering [errance] of Al Roberts, a “nomadism” that, according to some, is inherent in the film noir genre.’
  Teresa Castro, ‘Les cartes à travers le cinéma’, TexteImage 2 (2008)

See also the discussion of the map in this  film on (e)space & fiction