Abstract: A device that helps the blind to navigate by informing 3D images to them, it uses laser (or other methods like ultrasonic, photogrammetric tech etc.) to obtain a 3D image (collection of distance vectors), and conveys this image to the user by loudspeakers on a helmet or skin vibrators on a tactile board through the ‘Time Gap Method’, Time Gap Method means to use each loudspeaker (or vibrator) to represent one distance vector, direction of the vector represented by position of the loudspeaker (or vibrator), length of the vector is represented by the length of time between obtaining the 3D image (by emitting laser or other method) and the brief ringing of the loudspeaker (or brief vibrating of the vibrator).