A guidance system for guiding an aircraft service vehicle to a prescribed parking position adjacent to an aircraft, comprising first and second indicator markers arranged spaced apart from one another on said aircraft, wherein said indicator markers are positioned relative to one another to present a first prescribed visual pattern of said indicator markers along a first line of sight defining a first safe approach path for a driver of said service vehicle to follow when driving said service vehicle to said prescribed parking position, and wherein said indicator markers do not present said prescribed visual pattern away from said line of sight defining said safe approach path.