"A group of pilots and a group of non-pilots solved two representative types of navigation problems using three map-type navigation displays representing different movement relationships between an aircraft symbol and a ground station symbol. The three displays were as follows: (A) "aircraft movement" display: aircraft symbol translates in x and y and rotates in theta (heading), station symbol (map) is fixed; (B) "mixed movement" display: aircraft symbol fixed in position but rotates in theta, station symbol (map) translates in x and y; (C) "earth movement" display: aircraft symbol is fixed, station symbol (map) translates in x and y and rotates in theta, to indicate change in position and heading. The displays were presented by a static projection technique, with the different movement relationships explained verbally to the subjects. The two types of problems differed in the passage of a command track line either through or not through the position of the aircraft. To solve each problem a directional decision and a heading decision had to be made. A number of measures reflecting the speed and accuracy of these decisions were obtained. For the non-pilots, there were no significant differences in performance attributable to the different movement relationships. For the pilots, a significant interaction between the displays and the problem types was obtained for two of the measures. For the type of problem in which the command track line did not pass through the aircraft position, the "direction to turn" decision was made significantly more rapidly with either the "aircraft movement" display or the "mixed movement" display than with the "earth movement" display. For the same type of problem, significantly fewer reversals were made on those problems with other than a south heading with the "aircraft movement" display than with the "earth movement" display. As no significant difference in performance occurred between the "aircraft movement" and the "mixed movement" displays, it is suggested that the "mixed movement" type of display be subjected to further study, as this type of display has several operational advantages."--Abstract