The wireless cofferdam alarm system was developed to allow Maintenance Activities to monitor cofferdam blanking patch differential pressure seals on patches intended to be in service for extended periods (greater then seven days). The most typical application is for monitoring cofferdam seals for blanking patches use on extended Planned Incremental Availabilities (PIA) on Aircraft Carriers. The remainder of this manual will describe application of the system on this most typical application. Other system applications shall be planned in advance through consultation with NAVSEA 00C5.