Ships move in range bands, each about equal to 10,000
kilometres. They may move forward or back, but no side to side
movement is allowed. Ranges are determined by counting the
number of range bands between any two ships: for example, ships
in adjacent range bands are at a distance of 1.
Every ship his a velocity, either forward or backward, which
equals the number of range bands it moved in the previous turn.
(Initial velocity is determined by the referee). Each turn a ship
may change its velocity by up to its maneuver drive rating and then
moves a number of range bands equal to its new velocity. For example
suppose a ship with a maneuver drive-6 is moving forward
with a velocity of 4 range bands per turn. During its movement
phase it could speed up to 10 range bands per turn forward, change
to 2 range bands per turn backward, or anything in between.