XM/Sirius
Road Warrior
Joined: May 2007
Posts: 1,277
Likes: 4
From: Austin, TX - Some call it heaven.
I'm looking into this as well. I already have a Zumo 550, so I can get the XM module for about $200 online, much cheaper than the HD version.
But with the HD module, you use the same controls as the radio, and the volume adjusts automatically at higher speed, neither of which you get with the Zumo.
But with the HD module, you use the same controls as the radio, and the volume adjusts automatically at higher speed, neither of which you get with the Zumo.
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