"Dick Locke" wrote in message
...
Good idea. I still have to hook up a radar and possibly an autopilot
to the GPS too, so things will probably get more confusing. If I get
an expander, will that also avoid one device "contaminating" the
other?

Probably not. This would require an expander where each output is
galvanically isolated from the others. All expanders I know of are only
isolated from the power supply, while all outputs are fed from the same
DC/DC converter.

Meindert