A positioning assistance system for a vibrator truck, said vibrator truck comprising: - a motor for moving the vibrator truck and a control system comprising a motor control unit to control the motor; - a vibratory system comprising a vibratory part and a baseplate used to transmit the vibrations generated by the vibratory part through the ground; - a lift system for lifting up and down the vibratory system, wherein the positioning assistance system is configured to: - determine a vibration point distance between the vibrator truck and the vibration point location; - determine a stopping distance (D Stop1) that the vibrator truck is susceptible to cover before stopping, according to a deceleration speed profile generated for a determined current speed value of the vibrator truck, assuming that this deceleration speed profile is applied to the motor of the vibrator truck from the moment corresponding to this determined current speed value; - determine a time (Tstopi) for stopping the vibrator truck at the vibration point location according to the current speed of the vibrator truck, when the stopping distance (D Stop1) corresponds to said vibration point distance (D vp1); - trigger the lifting down of the baseplate of the vibratory system, when at least the following condition is met: the vibrator truck speed is superior to a first positive threshold value and said stopping time (Tstopi) is inferior or equal to a time for lifting down the vibratory system to the ground, so that the lifting down of the baseplate is triggered before the vibratory truck reaches the vibration point location. - a motor for moving the vibrator truck and a control system comprising a motor control unit to control the motor; - a vibratory system comprising a vibratory part and a baseplate used to transmit the vibrations generated by the vibratory part through the ground; - a lift system for lifting up and down the vibratory system, wherein the positioning assistance system is configured to: - determine a vibration point distance between the vibrator truck and the vibration point location; - determine a stopping distance (D Stop1) that the vibrator truck is susceptible to cover before stopping, according to a deceleration speed profile generated for a determined current speed value of the vibrator truck, assuming that this deceleration speed profile is applied to the motor of the vibrator truck from the moment corresponding to this determined current speed value; - determine a time (Tstopi) for stopping the vibrator truck at the vibration point location according to the current speed of the vibrator truck, when the stopping distance (D Stop1) corresponds to said vibration point distance (D vp1); - trigger the lifting down of the baseplate of the vibratory system, when at least the following condition is met: the vibrator truck speed is superior to a first positive threshold value and said stopping time (Tstopi) is inferior or equal to a time for lifting down the vibratory system to the ground, so that the lifting down of the baseplate is triggered before the vibratory truck reaches the vibration point location. - determine a vibration point distance between the vibrator truck and the vibration point location; - determine a stopping distance (D Stop1) that the vibrator truck is susceptible to cover before stopping, according to a deceleration speed profile generated for a determined current speed value of the vibrator truck, assuming that this deceleration speed profile is applied to the motor of the vibrator truck from the moment corresponding to this determined current speed value; - determine a time (Tstopi) for stopping the vibrator truck at the vibration point location according to the current speed of the vibrator truck, when the stopping distance (D Stop1) corresponds to said vibration point distance (D vp1); - trigger the lifting down of the baseplate of the vibratory system, when at least the following condition is met: the vibrator truck speed is superior to a first positive threshold value and said stopping time (Tstopi) is inferior or equal to a time for lifting down the vibratory system to the ground, so that the lifting down of the baseplate is triggered before the vibratory truck reaches the vibration point location.