Hi Line Sat Nav wiring loom

[Duotone]

I have recently purchased from Les at SMC a complete Hi Line sat nav system
I've fitted a few of the units to the boot area but not yet the loom.
When I connected everything up as in Keith's "How To" I was left with two plugs that I am not sure about..
Can anyone help. It's possible they may not be used..
The first is a 8 pin plug.
Wires.
OS - this wire goes to the other small mystery plug
OG - this wire goes to the other small mystery plug
PK
GW
WRY- K Bus
RW
RG- telephone mute, goes to pin 4.. radio module.



Dave T