Nav 4 vs 660 vs other?

I had started a thread in the wrong location http://forums.bmwmoa.org/showthread.php?t=44540 but wanted to get more info. As mentioned in this thread the Nav 4 version is crippled vs the standard 660. Just curious what is meant by crippled? Not really interested in adding the XM since it is just more costs that I can compensate with mp3s and a blue tooth headset. Still haven't decided on the headset version yet. Want an AD2P capable unit. Hopefully will be pairing a phone (just for curiosity if some calls) and somewhere in the future a radar detector.

From what I have heard the Garmin is the standard for a dedicated motorcycle GPS. Thoughts? Any other experiences?

I have a 660, get one. Love it. Great review here.

Why? Wired headset or BT headset (Nav 4 is just BT), no xtra large cradle in the way with no-use xtra buttons, and $$$$ less.

AZ-J said:

Why? Wired headset or BT headset (Nav 4 is just BT), no xtra large cradle in the way with no-use xtra buttons, and $$$$ less.

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Funny - because those buttons are the reason I love the Navigator series. Trying to zoom in/out using the on-screen buttons with gloves on just really doesn't work for me, and becomes a distraction I don't need when riding. I have a NAV-III and a Garmin 2720 - basically the same unit (with a few things like BT on the NAV-III, which I use a lot..), but the useability of the two on the bike, the NAV-III wins hands down.

Distraction while riding is an obvious safety hazard. Trying to zoom in with an on-screen button, and having the GPS decide you want to mark a location (the most common result), then having to back up, get back to map mode and try again - is a dangerous distraction IMHO, vs - press the + button.

Na..

I have no issue zomming on my 660 with gloves on. You must have extra large hands.