Hello Frank.
We have an experience with these GPS Navi together with Rockford Fosgate system:
1) SkyNavi
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2) Dcpvideo
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3) Hits-cn
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4) nTray/Waywell
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5) Roadrover
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6) Phantom (Caska)
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For correct connection you should use an adapter DSA-01 like this:
https://www.out-club.ru/board/showthread.php?t=21078
more links about it:
http://www.4caraudio.ru/product_775.html
http://www.autoperehodnik.ru/catalog/akkucstica/521/
If you have more questions - feel free to ask us.