A system for assisting drivers of Bomb Cart and Shuttle Carrier vehicles in properly positioning their vehicle types, which are either unloaded or loaded with one or more containers beneath a gantry crane having a landside sill beam mounted on a landside rail and a waterside sill beam mounted on a waterside rail, each sill beam having an interior side facing the interior side of the opposing sill beam and an exterior side facing away from the opposing sill beam, the acceptable position being one in which the center of the side of the vehicle closest to either sill beam is less than a predetermined, known distance away from the center line of the crane represented by a line drawn from the center of the waterside sill beam through the center of the landside sill beam and the vehicle is skewed less than a predetermined, known amount, skew being the angle, if any, formed between a line drawn parallel to either sill beam and a line drawn parallel to the longitudinal centerline of the vehicle, comprising: at least one first laser scanner means attached both to the exterior and interior sides of the landside sill beam for detecting the presence, location and orientation of any loaded or unloaded vehicle entering within the range of said first laser scanner means; first target means each having a known shape and dimensions and at least one of which is attached to each side of each vehicle for reflecting emissions from said at least one first laser scanner means; at least one second laser scanner means attached to both the exterior and interior sides of the landside sill beam for detecting the presence, location and orientation of any container loaded on a vehicle entering within the range of said second laser scanner means; second target means each having a known shape and dimensions and at least one of which is attached to each side of each container for reflecting emissions from said at least one second laser scanner means; at least one direction indicator means attached to each of the exterior side and the interior side of the landside sill beam for indicating to vehicle drivers whether their vehicle is properly positioned or needs to be moved forward or backward and whether their vehicle orientation is skewed in excess of a predetermined acceptable amount and needs to be repositioned; and computer means connected to the crane, to each of said at least one first laser scanner means and said at least one second laser scanner means and to each of said at least one direction indicator means for receiving scanning data from said first laser scanner means and said second laser scanner means in order to calculate the location and orientation of any vehicle within the range of said first laser scanner means and the location and orientation of any container loaded on a vehicle within the range of said second laser scanner means and, further, for activating said direction indicator means. at least one first laser scanner means attached both to the exterior and interior sides of the landside sill beam for detecting the presence, location and orientation of any loaded or unloaded vehicle entering within the range of said first laser scanner means; first target means each having a known shape and dimensions and at least one of which is attached to each side of each vehicle for reflecting emissions from said at least one first laser scanner means; at least one second laser scanner means attached to both the exterior and interior sides of the landside sill beam for detecting the presence, location and orientation of any container loaded on a vehicle entering within the range of said second laser scanner means; second target means each having a known shape and dimensions and at least one of which is attached to each side of each container for reflecting emissions from said at least one second laser scanner means; at least one direction indicator means attached to each of the exterior side and the interior side of the landside sill beam for indicating to vehicle drivers whether their vehicle is properly positioned or needs to be moved forward or backward and whether their vehicle orientation is skewed in excess of a predetermined acceptable amount and needs to be repositioned; and computer means connected to the crane, to each of said at least one first laser scanner means and said at least one second laser scanner means and to each of said at least one direction indicator means for receiving scanning data from said first laser scanner means and said second laser scanner means in order to calculate the location and orientation of any vehicle within the range of said first laser scanner means and the location and orientation of any container loaded on a vehicle within the range of said second laser scanner means and, further, for activating said direction indicator means.