Mark - Raymarine L750 Operating Handbook

Chapter 3: Operating Instructions
When the Buzzer entry is set to Off, the buzzer is silenced for all of the
alarms. Once you choose this option, if a shallow alarm, deep alarm or
fish alarm occurs, the "S" or "D" symbol will flash, but the buzzer will not
sound. (You can enable the buzzer again at any time by pressing the
Alarm button, then the Buzzer Soft Key, and turning the item on again.)

Mark

The Mark button allows you to set a vertical marker on the display over a
selected point on the bottom. See Fig. 3-20. As the display scrolls past,
the vertical line keeps the same position relative to that point on the
bottom. The distance measurement shows how far you have traveled
since you set the mark. The distance will continue to increase until the
line leaves the left edge of the display, or until you press the Mark button
again.
The calculation for the Mark line is based on the information used for the
Log/distance display. If you reset the log, the Mark function will be reset
also.
Fig. 3-20 Mark Display
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Mark line
Mark distance