Aspects of the disclosure relate generally to active cooling or removing heat generated by a processor in a computing device. A first and second station are connected by the pair of conductors. The head is positioned at a second radial location, a second phase error is measured in response to the reference pattern at the second radial location, and a second repeatable runout of the second phase error is measured. The bottom of the seismometer sealed chamber protrudes through the opening of the protective hood to be seated in direct contact with the seabed. The system may be integrated with a weapon system to use weapon system sights.