Yeah. If you get this stuff on a new boat or barge, you have to basically send around guys with voltmeters with really long leads, all over the ship... if I was in charge of the bridge I'd do that. It's relatively inexpensive, and either finds the problem or gets rid of one common variable.
This is what I do for a living actually - and concrete / mixed structure corrosion control is unfortunately a lot more expensive and difficult than single structure (ie steel hulled vessels). A typical concrete CP system will be low output but with dozens to hundreds of individually controlled zones and reference electrodes to monitor the system performance.
