Furuno 520 - Manual (Page 34)

3. STEERING MODES
3-18
Button (FAP-6211, 6212), Lever (FAP-6221, FAP-6222),
Dodge (FAP-6231, 6232) type remote controller
These controllers may be used in the STBY, AUTO and NAV modes.
1. For button and lever type remote controllers, turn on the remote controller
power.
The dodge type remote controller doesn’t have the power switch, it can be
operated by simply pressing the direction buttons.
Turning power on, button and lever type remote controllers
The indication “NFU” (No Follow-Up) appears on the control unit. (For dodge
type, NFU appears while a direction key on it is pressed.)
NFU
359.9
RUDDER
FU mode
(Non Follow-up)
Heading from
heading sensor
Rudder angle (XTE or Deviation)
HDG
M
0
40 20 10 40 20 10
Heading mode
M: Magnetic
T: True
359
Course set
NFU (No Follow-Up) mode display
Non-Follow up (NFU) is a manual steering mode that moves the rudder as long
as the button or lever is pressed.