I have a ram mount on my legend, which also has 7/8 inch bars, for my GPS. I have the absolute basic U-bolt with ball and then the standard arm. It's absolutely wonderful - inconpicuous when the GPS isn't mounted, flexible when it is.
http://cyclegadgets.com/Products/RAM/ram.asp?prod=STD
There's not, I take it, a cradle made by RAM quite yet, although I understand touratech makes one.
The best source for information on this stuff, actually, is the ADVRider web site. Here's a link with instructions on making a RAM mount for a 60CS.
These guys, for the record, are absolute freaks. They know everything and are really helpful - even if you don't ride an GS or a VStrom or Tiger.
You'll also find wiring threads.
http://www.advrider.com/forums/showt...ht=GPSMAP+60CS
Brian