A template for use in positioning subsea wellbores that has a drop away funnel that extends laterally from the template. In one embodiment, for example, a display device includes a transmissive display configured to be illuminated through a back surface and a reflective display configured to be illuminated through a front surface. A shock wave formed by the injected propellant acts, after reflection by the thrust wall end and in combination with the aerovalve, to compress and conserve, or increase, the pressure of the injected propellant. A large number of sensors can be multiplexed into the architecture of the sensor array. The suction cup may have a support or hook having a curved portion. The hydraulic motor acts as both a drive unit and a braking unit.