Dual frequency operation covering 5 to 1000 meters of depth in 8 range steps manually or automatically, with a single keypress selecting high frequency (200, 135 or 100 kHz) or low frequency (33 or 50 kHz). Readout in fathoms or feet is also available. Fully automatic functions including depth range selection, receiver gain and TVG settings and transmit power level for hands-free operation under most bottom conditions. Manual override is also possible in situations where you want the depth range fixed or where you want to control the gain or power for specific applications. Password-protected menu system prohibits unauthorized access to critical control parameters and software settings. 1kW rms (max.) transmit output with power level automatically adjusted to suit the range selected. Manual override is also possible in special situations where more power is needed for shallow water sounding. Shows LAT/LON and water temperature data in addition to soundings and associated date/time with appropriate optional sensors plugged in. These types of data are automatically output via RS-232C and RS-422 ports for use by ECDIS, VDR and other onboard electronics. Large capacity non-volatile (flash) memory automatically stores sounding data, associated date/time and other optionally available data for up to 24 hours. Stored data can be displayed graphically as well as digitally in a special data history window accessible with a single keypress, and can be uploaded to a PC for off-line processing and analysis. A graphics printer can be plugged into a devoted rear panel connector to print out a monochrome hard copy of the current echogram. Echogram feed rate can be changed in 3 steps for extended display period across the screen without affecting the sounding rate. An extensive alarm function visually and audibly warns the navigator against decreasing depth, missing or weakening bottom echo, falling power supply voltage and audibly against power outage/shutoff. A separate AC power adapter (Model AC-2000) is supplied as standard. When connected up via the AC-2000, the system will automatically switch to the ship's auxiliary DC power source in the event of an AC power line failure. Complies with IMO Resolution MSC.74(69) and MED.