Every compass ... will suffer from local deviation effects, due to local magnetic interferences ... - almost any ferrous or magnetic object. These effects will vary at different points of the compass, for example only a degree or two at a due north heading, and 5 or 6 degrees at an easterly heading.
When I saw the ads for this flick, it instantly brought to mind 'The Driver' (1978, and starring, of all people, Ryan O'Neal.) Right down to the protagonist being called only... The Driver! http://www.imdb.com/title/tt0077474/plotsummary