Because of the vast amount of data and paper generated by this system, the data logger and color printer should only be turned on in an area of interest or when unusual sign begins to show up.  A trained scientist should be available on each watch to begin logging data and to record station data and file names in the notebook provided.  Files should be backed up onto optical disks and magnetic tape before the end of the cruise following instructions in the ARC Manual.  The printer pen cartridges and paper should be replaced as needed.  The SIMRAD EK 500 settings will be set at the beginning of the cruise and remain the same throughout the cruise.  When data are being logged, the printers need to be checked every hour at a minimum.