Electromagnetic Compatibility is the capability of electrical and electronic systems, types of equipment, and devices to operate in their intended electromagnetic environment within a defined margin of safety, and at design levels or performance, without suffering or causing unacceptable degradation as a result of electromagnetic interference (Electronic Project Design 2009). So, various aspects of the Ocean including the natural earth magnetic field at certain depth and the unnatural magnetic fields caused due to human being for their different installment of instruments have to be sorted out so that no interferences occur at the time of ocean depth probe.
All types of equipment and systems must be designed to meet electromagnetic compatibility (EMC) specifications. To achieve this aim, special design techniques are necessary. Their effective use in practical applications depends on the understanding of the underlying physical principles. EMC problems involve complex electromagnetic interactions and hence can only be tackled effectively by a combination of experimental and numerical tools (Christopoulos 1992, pp. 239-247)
At the time of investigation of the depth of the ocean, using the different techniques to explore the ocean for various purposes the movement of the sound wave in the different level of water is different, depending upon the nature of the water quality and various objects and animal present at a particular level. Thigpen et. al (1985) have found out that "in marine seismic exploration, an acoustic source disposed beneath the water surface generates a signal which is reflected from layers beneath the ocean floor and received by hydrophones connected to a remote recording unit." The further investigation explains that "the received reflected signal provides information about the subsurface characteristics of the earth" (Thigpen, B B et al. 1985). This production of sound may interfere if not used properly for the investigation.
In an experimental report find out by Thigpen et. al. (1985) shows that "conventional acoustic sources used in marine exploration consist of an array of many air guns or water guns fired simultaneously at pre-selected time intervals." Explaining the effects by this experiment they say "the shape of the acoustic wave or "signature" of the array is dependent upon the depth at which the array is fired and on the synchronization of the firing instant among all the guns in the array." They find out some contrast results with word of caution that "if one of the two parameters or both are not substantially the same for all guns the seismic signature will be less than optimum and if the depths of the guns are different, the firing instant of each gun can be changed by fractions of a millisecond so that the resulting acoustic wave front is at maximum amplitude and strength."
JAMSTEC (2007) has provided various techniques to measure the depth of the ocean and to find out different aspects of the benefit of ocean probe as follows:
Sensors to Investigate the Ocean at Different Depths: With the use of CTD (Conductivity (salinity), temperature, depth), an observational instrument to measure the conductivity (salinity), temperature and underwater pressure (depth) of the ocean, electrically, with its deployment in the ocean connected by cable to observe a vertical profile of the temperature and salinity, useful data is produced to be utilized to analyze the characteristics of seawater and current.