a) Have you ever had a problem with the cup suction? I think it could be unsafe if the GPS were to come up loose while riding.
I have been running this GPS for about 2 years (5000+ miles) and I have never had any problem with it losing suction. If for some reason it did it has the power connector to hold it on until you can stop to fix it.
When you hard wire it - just cut the plug off and strip the ends. The ground is wound around the positive wire. The other big wire is the antenna for the traffic function.
b) Has your GPS ever been affected by the vibration? I have the same GPS than you do (755T), and at the store, they said I need one for motorcycles due to the vibration a motorcycle produces. I am not sure if that is true or not.... Again, I have never had a problem with it and the vibration level on the Wing or Vision is not like a Harley so I don't think it is an issue. If it lasts 3-4 years I'm happy and feel like I got my moneys worth out of it. The 660's are $500-600 so you can go thru three or four 775T's for that price ! At any rate it is MUCH better than being stuck with the factory one that can't be upgraded or replaced inexpensively.
Like you, I am not planning to ride on hard rain, and in the worse case scenario, I can buy a, somewhat, water resistant cover.
Also, since we have the same GPS, have you ever created a Course on your computer and then transfered to the GPS itself? If so, how do you do it? What programs do you use? I have created many "rides" for this unit. Last year we went to the Rocky Mountains with a bunch of Gold Wings and we downloaded GPS routes of a bunch of different rides like Pikes Peak, Rocky Mtn National Park, Independence Pass and they worked great ! You can also reverse the trip and follow it in the reverse direction if you want.
You can set up your route in Streets & Trips 2010 or MapSource (Garmin's product). Mapsource is a little more difficult to use. S&T is much easier and is easy to download to your unit via the USB cable. Just set your route using the trip planner and then use the "download .GPX file" to your hard drive so you can save your trips or hit the "send to device" button and it will send it directly to the connected device.
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