Furuno gp-31 Manuel D’Utilisation

3. The cursor is on the first line. Press the

[ENT] key. The following window ap-
pears.

Figure 7-12 LAT/LON, LC TD,

DE TD selection window

4. Select XX.XXX’, XX’XX.X”, LC TD (Lo-

ran C) or DE TD (Decca).

XX.XXX’:  Shows position with no sec-
onds.
XX’XX.X”: Displays position with sec-
onds.

5. Press the [ENT] key. If you selected lati-

tude and longitude go to step 7.

6. For Loran C or Decca, do one of the fol-

lowing:

a) The cursor is on the LORAN C field.

Press the [ENT] key.

b) Use the cursor pad to choose GRI

code and secondary codes, referring
to the Loran C chain list on page A-3.

c) Press the [ENT] key.

d) If necessary enter TD offsets in ap-

propriate TD field(s) to refine position
accuracy.

a) Select the DECCA field and press the

[ENT] key.

b) Use the cursor pad to choose Decca

chain number and lane pair (R, Red,
G, Green, P, Purple), referring to the
Decca chain list on page A-4.

c) Press the [ENT] key.

d) If necessary enter TD offsets in ap-

propriate TD field(s) to refine position
accuracy.

7. Press the [MENU] key twice to finish.

GPS uses UTC time. If you would rather
use local time, enter the time difference
(range: -13:30 to +13:30) between local
time and UTC time.

1. Press the [MENU] key once or twice to

open the menu.

2. Select SYS SETUP and press the [ENT]

key.

3. Press 

▼

 to select the TIME DIFF field

and press the [ENT] key.

4. Press 

▲

 or 

▼

 to display + or –.

5. Enter time difference with the cursor

pad.

6. Press the [ENT] key.

7. Press the [MENU] key twice to finish.

The GPS SETUP menu smooths position
and course, averages speed, applies posi-
tion offset, and deactivates unhealthy sat-
ellites.

1. Press the [MENU] key once or twice to

open the menu.

2. Select GPS SETUP and press the [ENT]

key.

Figure 7-13 GPS SETUP menu

3. Select item and press the [ENT] key.

4. Change setting with the cursor pad and

press the [ENT] key.

5. Press the [MENU] key twice to finish.