Furuno GP-3500F - Manual (Page 71)

4. MARKS & LINES
4-7
CURSOR
a) Operate the trackball to place the cursor on the mark you want to erase.
b) Press the [ENTER] knob.
c) Press the [MENU] key several times to close the menu.
AREA
a) Operate the trackball to move the cursor to the starting point of the area.
b) Press the [ENTER] knob.
c) Operate the trackball to move the cursor to the ending point of the area.
A green rectangle appears.
Area (green)
Starting point
Cursor
Erased area
d) Press the [ENTER] knob. The color of the rectangle changes from green to
white.
e) Press the [ENTER] knob again.
f) Press the [MENU] key several times to close the menu.
INSIDE, OUTSIDE and ALL
a) Press the [ENTER] knob.
b) Press the [MENU] key several times to close the menu.