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L-3 ELAC Nautik
Sound Velocity
Sound travels at varying speeds in water, depending upon the salinity, temperature and density.
The standard NAV(Navigation) default setting for sound velocity is 1500 m/s. If a sound velocity
measuring system is available and the user wishes to adjust the sound velocity of the depth
sounder, call up the PARAMETERS MENU and press the following keys:
• CURSOR W (2x, to mark Sound Velocity)
• ENTER (1x, to mark 2nd digit)
• CURSOR V or W (to alter 2nd digit)
• ENTER (1x, to confirm selection and jump to 3rd digit)
• CURSOR V or W (to alter 3rd digit)
• ENTER (1x, to confirm selection and jump to 4th digit)
• CURSOR V or W (to alter 4th digit)
• ENTER (1x, to confirm selection)
• ESCAPE (2x, to leave the MENU)
Units
The standard default unit of measurement is metres. It is however possible, if the user wishes, to
choose either fathoms or feet. In order to alter the unit of measurement, call up the PARAMETERS
MENU and press the following keys:
• CURSOR W (3x, to mark the word Units)
• ENTER (1x to mark units selected)
• CURSOR V or W (to make selection)
• ENTER (1x, to confirm selection)
• ESCAPE (2x, to leave the MENU)
Depth mode
The standard default depth measurement mode is DBK (depth below the keel). It is however
possible to change this mode to either DBT (depth below the transducer) or DBS (depth below the
surface). In order to alter the mode of depth measurement, call up the PARAMETERS MENU and
press the following keys: