Simrad CE34 ChartSounder Manual page 49

CE34/44/54 Chart menu and INFO windows Chapter 3-23
Show range - can be set to WITH BACKGROUND, ON or OFF:
WITH BACKGROUND - will add a small line to the chart display indicating
that the length of the line equals a certain number of nautical miles/km - the
indication is highlighted with a background color.
ON - same as above, but without background color.
OFF - indication is not shown on chart.
Soundings - can be set to ON or OFF.
ON - the information will be shown as selected i.e. in feet, fathoms or meters.
OFF - soundings are not shown on chart.
Underwater objects - can be set ON or OFF= Not shown on chart.