I'm getting ready to order and came across with video. What is an HD Bomm and this video makes it sound like I have to plug in to the front of my radio at the aux port? I take it the extra kit you buy to play through the bike speakers is not plug and play?
The HD Bomm gives you the ability to talk on the RT Zumo, while you can Bluetooth your phone to the RT Zumo and you could make and receive calls, however, you could not talk to the person with the mic, you could only hear the people on the other end, so he produced the HD Bomm and with this you can talk on the unit also. So, unless you want the ability to talk on the unit, the HD Bomm is not needed, it is a nice addition though.
Have you decided what you want to do as far as capabilities? I ask because I see that you mentioned a couple of different scenarios, so I wondered if you had any better idea, as I have installed and set this up several times and can give you what may or may not work. Because I don't think it has been mentioned but, there are actually two of each model 660 and 665, there is the Zumo 660/665 and the RT Zumo 660/665, if you use the HD dash mount with the NIM (which is a great interface) either of the models of 660/665 will in fact hook up to the mount BUT ONLY THE RT ZUMO 660/665 will disrupt the radio with the NIM, the Zumo 660/665 will not.
So if you want just GPS you can use the dash mount with either of the four Zumo's, if you want XM then you need one of the two 665's, if you want to disrupt the radio and spoken directions then you will need the dash mount, NIM, and either of the two RT Zumo's, if you want to be able to talk on the phone with the unit then you will need the dash mount, NIM, HD Bomm, and either of the two RT Zumo's. I hope this helps some, but if you know what you want to do specifically I probably can help with some info.
Just in case RT = Road Tech and this is HD's branded version of the Zumo. NIM = Navigation Interface Module and I referenced the dash mount in all items because you had said that you really liked it (I also think it is the best choice if using any Zumo model). I also stress the point of the two models of Zumo's, because you would not understand the amount of people that go online and buy the Zumo 660/665 and the NIM only to find it will not function correctly, because it is not the RT version. I actually called and discussed this with Garmin several years ago when the NIM was first introduced, because it is easy for most to make this mistake, they are both called Zumo 660 or Zumo 665, my point was they should have changed the HD branded to say Zumo 670/675 anything other than just adding RT to the exact same name and number.
It said someone had made a reply while I was typing did I want to read it first, I decided no, but I didn't know it would be you Jim, anyway, Jim knows his product (which like I said before is a great product, I have had one for 5 yrs?), so now you have two answers, the only thing I would add after reading Jim's reply would be that with the NIM you would not need the cable to the front Aux at all unless you went with the 665 and used XM, also if you use the front input for your spoken directions then the radio has to be on the Aux input to hear them, I just add this info because a lot of people do not think about these things.