Systems specially designed or modified for the automated control of the motion of submersible vehicles specified above, using navigation data, having closed loop servo-controls and having any of the following: 1. Enabling a vehicle to move within 10 m of a predetermined point in the water column; 2. Maintaining the position of the vehicle within 10 m of a predetermined point in the water column; or 3. Maintaining the position of the vehicle within 10 m while following a cable on or under the seabed;