I have dual E-80's. One at the helm and the other at the nav station.
My Raymarine E-80 isn't receiving boat speed & wind information from my
other Raymarine instruments. Some of the E-80 functions are effected,
such as MARPA.

It's not practical to chase down wiring issues for a few weeks at
least.

1) Is there a quick fix to tell my E-80 to use SOG (from GPS) instead ?
2) Is there a way to get my E-80 to display traffic it see's on the bus
connected to my other instruments ?