If the 998 has older software ...power off the unit....insert SD Card ....power on unit...follow prompts...
If the 998 has newer software...power on the unit...insert SD Card ...follow prompts...(brand new unit...I would think this procedure should work)...
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Basic default settings are a good place to start with the unit...(you can restore defaults and get everthing to default)...
Then change....:::
*SI Range to 60-70ft left and right...(less Range in shallow water <5ft deep...maybe 30-40ft left and right)...
*SI Sensitivity change to adjust brightness of image dependent on bottom composition (hard bottom will need lower SI Sensitivity...softer bottoms will need higher SI Sensitivity)...
*SI Contrast 10-12...(higher will make fish echoes pop out but make the image grainy)...
*Si Sharpness Off....(higher will make fish echoes pop out but make the image grainy)...
*Color Pallete...choose a color that you can see well for the lighting condition of the day (sunny - I like Inverse or Green...cloudy - I like Inverse or Blue)...
*Chart Speed ...match boat speed ...1mph = 1 Chart Speed, 2mph = 2 Chart Speed, etc
Use the 4way cursor to stop the screen scroll and change different settings to see how that setting affects the image....
Rickie


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