Thanks Cap'n John - The four pole switch should work and I think I will try it and see what happens. The Raymarine guys don't agree that the signal cables
from the transducers can be switched and that each needs to talk to a dedicated pod. I am clearly out of my depth
with this but, alternatively, I wonder if I can use the two pods and then switch the outputs he instrument.
I'll keep your fancy idea until later.........................
Congratulations on setting off on your cruise
- I have 15 months to wait !!