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I used a Garmin Zumo 450 on my 2007 Ultra until I bought my 2014 with the 6.5 Boom, so I sold the 450 to a coworker. I'm wishing I'd kept it now, that 7 year old Zumo 450 was head and shoulders a better GPS than the one in the 6.5 Boom. I'm getting by with the new one and I'm not having any problems with it, but I don't particularly like it.
I would go with the Garmin.
I ride a 2013 Street Glide with a Zumo 660, Sena 20S, and my Galaxy 5S all blue toothed together. I put my radio in Aux mode when its just my GPS and it all goes through my stereo speakers.
I like the feature of bringing it in the house to place new routes and tunes in it.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.