Furuno FR1500 Mk3 - Manual (Page 29)

3-1
EXTERNAL SIGNAL INPUT, OUTPUT
3.1 External Input
All external equipment and the antenna unit are connected to the SPU Board.
Several connectors are of the XH-5P type., and these are marked with an asterisk
in Figure 3-1. FURUNO can supply an XH-5P signal cable for those connectors.
Figure 3-1 Location of input connectors on the SPU Board