Interface

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JimB
Posts: 79
Joined: Tue Mar 12, 2013 12:52 am

Interface

Post by JimB »

I have a GNS430 connected to my Sport HS using RS232 and ARINC. I'm considering upgrading to a separate GPS (GPS 175) and Nav-Comm (GNC255). With the 430 I use the CDI button to switch between GPS and VORLOC mode. With two independent units how does the EFIS "know" to use the Nav-Comm ARINC data for a ILS rather than the GPS data?

Thanks

Jim Butcher
Bobturner
Posts: 425
Joined: Mon Mar 11, 2013 6:34 pm

Re: Interface

Post by Bobturner »

I have a Horizon but it’s probably the same. Push the right hand button to bring up all the button labels. On the (I think) second from the right button you see labels for VOR-Loc#1, GPS#1, etc. Select the nav source you want. You must have your current setup set to ‘auto switch with Garmin CDI button’ or something like that. You’ll want to turn that off. And you’ll need to identify the new radios as vor#1, gps#1, etc.
GRT_Jeff
Posts: 656
Joined: Tue Dec 11, 2012 12:11 am

Re: Interface

Post by GRT_Jeff »

Change "NAV Mode Source" to "Internal" (General Setup) and you will have separate GPS and NAV selections on your NAV MODE button.

Does the 175 have the same ARINC-429 GAMA 429 interface as the GNS and GTN units?
JimB
Posts: 79
Joined: Tue Mar 12, 2013 12:52 am

Re: Interface

Post by JimB »

Thanks Jeff.

I haven't seen any install docs so I'm only guessing that ARINC would be the same.

Jim
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