Hi Bruno,
Hello from Brussels.
I can give you my opinion about both GPS because... I have both!
As a gesture, the dealer gave me the original HD GPS for free.
Before buying my FLHTCUSE, I had a Garmin Quest for 3 years on my Heritage, I really loved it. So when Garmin came out with the Zumo, I bought it without any hesitation.
Here are my thoughs about both GPS :
Advanced Audio Navigation System by HD:
+ fully integrated;
+ quick calculation of trajectory;
- switch of CD to find a point sometimes boring;
- very expensive;
- no maps.
Garmin Zumo
+ relatively cheap (vs. HD);
+ maps;
+ memory cards to get your music (with a 8Gb card = more than 2000 songs);
- not integrated;
- need the auxiliary input of HK = no radio and trip instructions at the same time.
Since I put my Zumo on the bike, I haven't used the other GPS anymore.
But again, this is a personal point of view.
For the installation of the Zumo.
You can opt for the RAM mount provided with the Zumo, but it is not that nice.
Thanks to the guys of cvoharley.com I bought the following stuff:
1. 30997MC Handlebar Mount 1"Mini Chrome from Techmounts. I bought it at
www.techbiker.com, the service is fantastic, I recommend it.
2. GOLD PLATED 3.5MM (1/8 INCH) RIGHT ANGLE STEREO PATCH CABLE from
www.soundprofessionals.com. I recommend the 1 meter (see my picture with a 24" which is too short to put it in the handlebar holes). You can find it here
www.soundprofessionals.com/cgi-bin/gold/category.cgi?item=SP-SPSC-73. Cut the original power adaptor and put a cigar lighter plug (see my picture also). This is the simplest solution and you don't see the cables hanging.
Good luck in your choice.
Phil