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whats the difference between garmin GMC 305 and GMC 507

lukej

Member
Whats the difference between garmin GMC 305 and GMC 507 besides the heading knob and the altitude knob and the track button and YD button??
 
The wiring harness was already made up by Stein for the 9A project that I bought. It has the plug for the GMC 305. Is the GMC 507 a "direct replacement" for the 305 without any mods to the plug?
 
It?s a different physical size, but the GMC307 would be a direct replacement for the GMC305. No sense in going with a GMC507 over a GMC307 if you are already wired for a GMC305/7.
 
Different

The wiring is not the same. Also the physical mounting and hole cut are not the same. Both of these would not be super tough to modify though.
 
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