Furuno GP-3500 Operator's Manual page 27

Entering numeric data
8. PLOTTER SETUP
LORAN-A GRI
CORRECTION 1
CORRECTION 2
TURN KNOB TO SELECT MENU.
SELECT THE ITEM OF EACH MENU BY TRACKBALL.
1. Press the appropriate numeric key.
2. Press the [ENTER] knob.
You may also enter a value rotating the by [ENTER] knob.
Note: If you make a value mistake, move the cursor to the error position and
then re-enter the proper value. The cursor for entering value is moved by
rolling the trackball in left-right direction.
Press the [CLEAR] key to erase the all value on the line selected with the
red cursor.
Cursor
00-01
+000.0 µs
+000.0 µs
Plotter setup menu
1. BASIC OPERATION
1-17