a central processing unit (CPU);

a display unit being electrically connected to the CPU for showing an aircraft image and a grid image therein, the aircraft image is located in the grid image; the aircraft image including a fuselage image, two wing images, two flap images, two spoiler images, two aileron images, a vertical stabilizer image, a rudder image, two horizontal stabilizer images, two elevator images and at least one engine image, the grid image has an upper grid face image and a lower grid face image, the upper grid face image corresponds to the sky and is above a back of the fuselage image, the lower grid face image corresponds to the ground and is below a belly of the fuselage image;

a flight data receiver unit being electrically connected to the CPU and including a pitch angle receiver, a roll angle receiver and a yaw angle receiver; the pitch angle receiver serving to receive a pitch angle data, so that the aircraft image shown in the display unit being in a flight attitude corresponding to the pitch angle data; the roll angle receiver serving to receive a roll angle data, so that the aircraft image shown in the display unit being in a flight attitude corresponding to the roll angle data; and the yaw angle receiver serving to receive a yaw angle data, so that the aircraft image shown in the display unit being in a flight attitude corresponding to the yaw angle data; and

a power supply unit being electrically connected to the CPU,

wherein the grid image has a left grid face image and a right grid face image, the upper grid face image is perpendicular to the left grid face image and the right grid face image, and the lower grid face image is perpendicular to the left grid face image and the right grid face image, and

wherein each of the upper grid face image, the lower grid face image, the left grid face image and the right grid face image includes a plurality of rectangular grids.