Underwater Electro-Magnetic
Measurement System

Installation of an Underwater Electro-Magnetic Measurement System (UEMMS) in support of Pacific Fleet requirements to magnetically range all classes of USN surface ships and submarines.

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Installation of a new UEMMS array consisting of a linear array of 22 sensors; 13 combination electro-magnetic triaxial (EMT) sensors, eight triaxial magnetometers (MT) and one conductivity, temperature and depth (CTD) sensor. The EMT and MT sensors was installed in a straight line and spaced on 20-ft centers. In addition, we installed four spare cables (two EMT and two MT) within the array area. The array was centered on and aligned perpendicular to the navigation channel. The sensor cables was routed from the array along the sea floor to the shore landing location where we installed a new, below grade transition vault to transition the sensor cables to a dry secure box located onshore at Polaris Point. Once onshore, the cables were connected to the data acquisition equipment located in the Force Protection Tower at Polaris Point.

Cable lay length total: 100,320'

Dive depths: 70'+

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