In the recent accident of 'Sindhu Ratna' also, the old batteries could not be replaced during refitting because of delay in contracting. This resulted in the tragic accident," he said adding CAG has also pointed out these deficiencies in its reports of 2008-09 and 2010-11The exercise also provided the Navy with an opportunity to validate its network centric warfare capabilities, with effective utilisation of its recently launched satellite GSAT-7