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  #1  
Old 02-04-2019, 01:47 PM
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Dugaru Dugaru is offline
 
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Default GMC 307 vs. GMC 507

Both the GMC 307 and the GMC 507 appear to be available for sale currently, and it looks like they're the same price. This prompts two questions:

1. Is there any reason anyone would still choose the 307 over the 507? From what I can tell, the 507 appears to be an upgrade and includes things like audible alerts. In other words, is there something useful that the 307 does that the 507 doesn't do?

2. Is there an upgrade path for 307 owners, short of "buy a new 507"? I would dearly love to have audible alerts of autopilot disconnect, since this has taken me by surprise on a few occasions. The flashing AP visual warning provided by the G5 is not very attention-getting.
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  #2  
Old 02-04-2019, 03:44 PM
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BCP Boys BCP Boys is offline
 
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http://www.vansairforce.com/communit...d.php?t=167951

Also, one thing they don't mention is the 507 has TRK button, the 307 does not. Also, someone said something about the VNAV button, both 307 and 507 have that I believe.
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Last edited by BCP Boys : 02-04-2019 at 03:46 PM.
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  #3  
Old 02-04-2019, 05:05 PM
Cannon Cannon is offline
 
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I had a similar question, and this was the reply from Levi at Garmin:

“From the installers perspective, the GMC 307 primarily interfaces to the system via RS-232. The GMC 507 interfaces primarily on the CAN bus. The GMC 507 was designed to allow us to create our GFC 500 autopilot with the G5 as the primary interface. From the user's perspective, the units are very similar. If you have already purchased the GMC 307, there is really no reason to upgrade.”

Edit: I should add that Levi’s response was specifically for my G3X Touch-based system. Might be different for G5 owners.
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Last edited by Cannon : 02-04-2019 at 06:42 PM. Reason: Added G3X Touch
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  #4  
Old 02-04-2019, 05:59 PM
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g3xpert g3xpert is offline
 
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G3X and G3X Touch systems provide autopilot tones and voice alerts and a means to connect a TO/GA button, so except for the TRK button, you already have most of the features provided by the GMC 507 with a GMC 307.

If you have a G5 based system, the extra features provided by the GMC 507 are very nice.

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  #5  
Old 02-04-2019, 07:01 PM
Lawndart145 Lawndart145 is offline
 
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Quote:
Originally Posted by g3xpert View Post
G3X and G3X Touch systems provide autopilot tones and voice alerts and a means to connect a TO/GA button, so except for the TRK button, you already have most of the features provided by the GMC 507 with a GMC 307.

If you have a G5 based system, the extra features provided by the GMC 507 are very nice.

I'm getting ready to install a 507 in my RV6A with a dual G5 setup. Am I correct in understanding that the TO/GA button option only works with the GTN series navigators not the GNS series navigators?
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  #6  
Old 02-04-2019, 07:40 PM
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g3xpert g3xpert is offline
 
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Quote:
Originally Posted by Lawndart145 View Post
I'm getting ready to install a 507 in my RV6A with a dual G5 setup. Am I correct in understanding that the TO/GA button option only works with the GTN series navigators not the GNS series navigators?
Hello LawnDart,

Yes, that is correct.

Keep in mind, however, that the Takeoff (TO) and Go Around (GA) autopilot modes work regardless. You will just have to initiate the missed approach on the GNS in addition to pushing the TO/GA button to execute the missed approach.

With a GTN navigator, it is a single button pressure to execute the missed for both the autopilot and the navigator.

Thanks,
Steve
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  #7  
Old 02-07-2019, 03:34 PM
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Dugaru Dugaru is offline
 
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Default G5 based systems

Quote:
Originally Posted by g3xpert View Post
If you have a G5 based system, the extra features provided by the GMC 507 are very nice.
Also my conclusion! Is there an upgrade path?

The 307's lack of an audible warning of autopilot disconnect is a major disadvantage.

Also, given that they are the same price, is there any reason that anyone in possession of all the relevant info would buy the 307 instead of the 507?
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