Furuno GD-1700C - Manual (Page 120)

3. RADAR OPERATION
3-26
3.18.5 Trail color (GD-1700C/1710C)
The GD-1700C/1710C can show echo trails in blue, yellow, green or white.
1. If not displayed, press the [HIDE/SHOW] key to display the radar soft keys.
2. Press the TARGET, TRAIL and TRAIL COLOR soft keys.
TRAIL COLOR
▲
¤ BLUE
¡ YELLOW
¡ GREEN
¡ WHITE
▼
Trail color window
3. Use the cursor pad to select the color desired.
4. Press the ENTER soft key.
5. Press the RETURN soft key twice to finish.