 Drivers were instructed to drive in pursuit of fixed and moving targets and to track them with a simple windscreen-mounted sight.The "Rhino"'s steering was infamously imprecise and it was found that the tracked Contentious performed better.As with the Centurion, Contentious was later up-gunned; first tested with the 84 mm 20 pounder, the Bovington example later gained a L7 105 mm gun, derived from the 20 pounder.