Electrodes as sensors in marine environment have been used on a regular basis for surveillance and signature applications. In these, the electrodes are protected from noise by the depth of the water column. In this report we are investigating the usability of electrodes in mobile systems. The noise level associated with moving water has been studied. The results show that the amplitude of noise increases with up to a factor of 100 in the frequency interval 0. 1 to 10 Hz. At lower frequencies the relative increase is lower but in an absolute measure higher. It was not possible to detect any difference in noise levels between the carbon fibre and Ag/AgC1 electrodes. The conclusion is that despite the increase of noise, the electrodes can be used on mobile platforms, i.e. for self ranging and survaillance. Special designed tests should be performed to investigate the effect of protection against water movements on the electrode.