Furuno RP-340, Руководство оператора

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2 RADAR MAP
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2.2.2 Erasing all marks/lines on the screen
You can erase all marks/lines displayed on the screen as follows:
1. Press the [NAV MENU] and [1] keys to show the RADAR MAP menu.
2. Press the [6] key several times to choose AREA or ALL.
AREA:
Erases all marks/lines within a square which is 20% larger than the
effective radar display.
ALL:
Erases all marks/lines which you have entered.
3. Press the [ENTER] key.
4. Press the [NAV MENU] key to close the menu.
About mark and line storage
Marks and lines are stored in a memory device on the RP Board and are backed
up with a battery. When the voltage of the battery is low, all marks and lines are
erased. After changing the battery, reenter the marks/lines if necessary.