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I did the splice and everything is now communicating as it should. Thanks for the help!

That also makes sense because I don’t have an antenna on the G5. The only antenna is on the GNX. (The course arrow only appears on the G3X when there is GPS signal). It could be that everything is working correctly now as you say, I just need either GPS (via G5 antenna) or MapMX to the G5. I’m...

Thanks man, I’ve scratched a hole in my head over this already. I’ve just searched all the Garmin manuals for a reference to splitting the signal and found nothing except for in the case of 2 G5s. I’m sure it will work as @will44s and yourself say it will, makes perfect sense…

I didn’t realise it it was possible to split the output, I have all the manuals and thought I’d seen everything in them! Thank you, I’m sure that will solve my problem. On the GNX side only ports 1 and 2 can do MAPMX, but it’s either/or, not both. Splitting would be the only way to send the Nav...

Apologies for not being clear. All works great except for no NAV info presenting on the G5. I can’t get it to connect through RS232 because MAPMX is not available as an option. No connection for NAV info (specifically) is coming through the can bus. G5 needs to connect directly to the navigator...

Hi. I have a G3X touch system in an RV8 with a GNX 375 and a G5 for backup. The GDU 460 is connected to the GNX via 2 RS232 wires (Connext and MAPMX). There is also 2 ARINC connections between the GNX and GAD 29. All LRUs are CAN connected. Everything works great. I’m trying to connect the G5...