Furuno GD-1700C - Manual (Page 62)

2. PLOTTER OPERATION
2-28
Erasing all marks, lines
You can erase all marks and lines collectively. Be absolutely sure you want to
erase all marks and lines - erased marks and lines cannot be restored.
1. Press the [MENU] key followed by the CHART SETUP, TRACKS & MARKS
CONTROL and ERASE T & M soft keys to show the ERASE menu.
2. Use the cursor pad to select ERASE ALL MARKS/LINES, then press the
EDIT soft key.
3. Push the [ENTER] knob to erase all marks and lines.
4. Press the [MENU] key twice to close the menu.