Movement is an action, and how far a character can move depends on their cards. However all characters have an innate ability to move via a pseudo-card, without the need for a specific movement card.
There are three broad types of movement:
Narrative - Where no rules are used, the game leader simply assumes that movement takes place. This is useful when it would be tedious to work out exactly how far each character moves.
Strategic - Travel that takes hours, days or weeks of character time is considered strategic. Unlike narrative movement, how far the characters can move is calculated and individuals' abilities can make a difference. Strategic movement is used when it is important to the game to know how long a journey takes.
Tactical Movement - Measured in seconds and in feet, tactical movement is movement on the battlefield when every step can mean the difference between life and death.
Metric Versus Imperial
Distances in the 6d6 system are measured in the imperial units of feet and miles. This is a homage to Gary Gygax's and Dave Arneson's creation Dungeons & Dragons and its ubiquitous 10' wide corridor. It is nothing to do with the fact that despite Britain having been officially metric for forty years, as a nation we are still confused by these new-fangled foreign measurements.
For those of you who wish to operate in metric, simply read any reference of 5' as 2m.