Image display

A method for displaying an image to a pilot of an aircraft, the method comprising:

• displaying, by a helmet mounted display, to the pilot of the aircraft, an image comprising one or more initial image components, the one or more initial image components including a first image component;
• providing, to one or more processors, an indication that the helmet mounted display is offset from a desired position for the helmet mounted display, the desired position of the helmet mounted display being a position in which, when the pilot controls the aircraft to perform a predefined operation, from the pilot's point of view, an initial image component displayed on the helmet mounted display is at a predefined position relative to one or more objects or features that are remote from the aircraft;
• determining, by the one or more processors, a specification for a further image component;
• and
• responsive to the one or more processors receiving the indication, displaying, by the helmet mounted display, to the pilot of the aircraft, an image comprising at least the first image component and the further image component;
• wherein
• the further image component has a fixed position on the helmet mounted display with respect to the first image component and indicates, to the pilot, one or more alternative positions on the helmet mounted display for the first image component.