A system comprising: one or more sensors configured to be positioned on an aircraft and to generate sensed ground obstacle information; a processor (36, 50) configured to: receive the sensed ground obstacle information from the one or more sensors; and determine locations of a first obstacle and a second obstacle relative to a first zone or a second zone within a predefined field of view based on at least one of the received sensor information, previously received surveillance data, or previously stored ground obstacle data; a communication device configured to receive height information of the first obstacle: wherein the processor is further configured to generate a numerical value based on the height information; and generate an image (120, 180, 340) comprising: an ownship icon (126, 224); first icon associated with the first obstacle, the first obstacle being located within the first zone; second icon (126, 224) associated with the second obstacle, the second obstacle being located within the second zone, wherein the first and second icons are visually different; and the numerical value; and a display device configured to present the generated image (120, 180, 340), characterised in that the generated image (120, 180, 340) comprises a vertical scale that represents at least one of height above ground or vertical distance from a predefined structure of the aircraft, and a horizontal scale that represents distance from the predefined structure of the aircraft, wherein the ownship icon (126, 224) is presented adjacent the vertical scale at a location on the vertical scale equal to a predefined height of the associated predefined structure of the aircraft. one or more sensors configured to be positioned on an aircraft and to generate sensed ground obstacle information; a processor (36, 50) configured to: receive the sensed ground obstacle information from the one or more sensors; and determine locations of a first obstacle and a second obstacle relative to a first zone or a second zone within a predefined field of view based on at least one of the received sensor information, previously received surveillance data, or previously stored ground obstacle data; a communication device configured to receive height information of the first obstacle: wherein the processor is further configured to generate a numerical value based on the height information; and generate an image (120, 180, 340) comprising: an ownship icon (126, 224); first icon associated with the first obstacle, the first obstacle being located within the first zone; second icon (126, 224) associated with the second obstacle, the second obstacle being located within the second zone, wherein the first and second icons are visually different; and the numerical value; and receive the sensed ground obstacle information from the one or more sensors; and determine locations of a first obstacle and a second obstacle relative to a first zone or a second zone within a predefined field of view based on at least one of the received sensor information, previously received surveillance data, or previously stored ground obstacle data; a communication device configured to receive height information of the first obstacle: wherein the processor is further configured to generate a numerical value based on the height information; and generate an image (120, 180, 340) comprising: an ownship icon (126, 224); first icon associated with the first obstacle, the first obstacle being located within the first zone; second icon (126, 224) associated with the second obstacle, the second obstacle being located within the second zone, wherein the first and second icons are visually different; and the numerical value; and an ownship icon (126, 224); first icon associated with the first obstacle, the first obstacle being located within the first zone; second icon (126, 224) associated with the second obstacle, the second obstacle being located within the second zone, wherein the first and second icons are visually different; and the numerical value; and a display device configured to present the generated image (120, 180, 340), characterised in that the generated image (120, 180, 340) comprises a vertical scale that represents at least one of height above ground or vertical distance from a predefined structure of the aircraft, and a horizontal scale that represents distance from the predefined structure of the aircraft, wherein the ownship icon (126, 224) is presented adjacent the vertical scale at a location on the vertical scale equal to a predefined height of the associated predefined structure of the aircraft.