Furuno FAR21x7 & BB FAR28x7 Operator's Manual BB FAR28x7 - Choosing External Radar (Image Source)

1. RADAR OPERATION
1-98
1.52.3 Choosing External Radar (image source)
Select the external radar to use in the dual radar display.
1. Right-click the MENU box.
2. Select 9 [CUSTOMIZE, TEST] and push the left button.
3. Select 7 [OPERATION] and push the left button.
4. Select 9 [DUAL RADAR] and push the left button.
1BACK
2 DUAL RADAR
OFF/MIX/COMBINE
3 COMBINE MODE*
OWN/EXT
4 COMBINE SECTOR*
START 000°
ANGLE 000°
5 COMBINE RANGE*
START 00.00NM
LENGTH 00.00NM
6 EXT RADAR
1/2/3/4
[DUAL
RADAR]
* Shown when 2 DUAL RADAR
is set for other than "MIX".
5. Select 6 EXT RADAR and push the left button.
6. Select
desired radar no. and push the left button.
Only the numbers of connected radars are valid. Radar no. is set on the
Installation Setting menu.
7. Push the right button four times to close the menu.