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<blockquote data-quote="bigkickr" data-source="post: 7848855" data-attributes="member: 641586">*Update*Over the weekend I replaced the GPS antenna that was included with the radio with the GM factory GPS antenna. I do have to say that it has made a significant difference in the signal quality and the speed in which the navigation finds itself upon starting the vehicle. With the old antenna the navigation wouldn&#039;t have located itself before I arrived at work, granted I work a mile from where I live but I still found this unacceptable. However this morning with the GM antenna the signal was there and the map had located itself before I was out of the neighborhood.One of my contacts at a GM dealer provided me with the location of the VSS signal wire in my vehicle. Given the performance of the GPS with the new antenna I don&#039;t know if this is necessary now???? I would still like to understand what the radio uses from that signal and how it incorporates it into the navigation system?On a side note the last piece of the puzzle to this whole thing is the audible turn by turn directions. I do have the settings in the radio switched &quot;on&quot; for turn by turn directions however the only audio I get from the navigation is at the very beginning &quot;please drive to the highlighted route&quot; and at the very end &quot;you have arrived at your destination&quot;. During the route itself I don&#039;t get a thing. Anyone have an insight into this?</blockquote>

[QUOTE="bigkickr, post: 7848855, member: 641586"] *Update* Over the weekend I replaced the GPS antenna that was included with the radio with the GM factory GPS antenna. I do have to say that it has made a significant difference in the signal quality and the speed in which the navigation finds itself upon starting the vehicle. With the old antenna the navigation wouldn't have located itself before I arrived at work, granted I work a mile from where I live but I still found this unacceptable. However this morning with the GM antenna the signal was there and the map had located itself before I was out of the neighborhood. One of my contacts at a GM dealer provided me with the location of the VSS signal wire in my vehicle. Given the performance of the GPS with the new antenna I don't know if this is necessary now???? I would still like to understand what the radio uses from that signal and how it incorporates it into the navigation system? On a side note the last piece of the puzzle to this whole thing is the audible turn by turn directions. I do have the settings in the radio switched "on" for turn by turn directions however the only audio I get from the navigation is at the very beginning "please drive to the highlighted route" and at the very end "you have arrived at your destination". During the route itself I don't get a thing. Anyone have an insight into this? [/QUOTE]

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