Kevm
I used a "RAM" mount £10.00 which I fitted to the Tiger Fairing using a home made Aluminum bracket. Not difficult. The Quest is mounted above the speedo and just below the screen. The Quest comes with a Mount you could use but the RAM mount is more secure because a clip fits over the Quest to hold it down.
Try this link
http://www.gpsw.co.uk/details/prod2393.html
Garmin make a Motorcycle mounting kit £50 to go with the Ram Mount. This includes a transformer to step down the 12v to 5.3v and a 2.5mm jack plug to connect to headphones.
Try this link
http://www.gpsw.co.uk/details/prod2642.html
It's a pain to have to spend another £60 but it's worth it. RAM supply a whole range of mounting brackets. Check out their web site.
http://www.ram-mount-uk.com/ram-hol-ga15.htm
Touratech also do a very sophisticated M/C mount which I guess costs £70 +. A bit over the top in my opinion. BMW riders use them alot. Partly because their bikes shake so much and partly because Touratech is a desirable brand.
:hammer: