With the ST1100 I used a Garmin GPS mounted in a RAM and a non-touch screen iPod in a Aqua box, all awhile my iPhone sat under utilised in my jacket pocket with GPS, Music and phone.......
So with the new ST1300 I set about using the iPhone......so the issues that needed to be overcome with the iPhone.......mounting, charging, waterproofing, conductive touch screen and connection to helmet. The connection to Helmet is solved with one of DMME Bikecom systems, give GPS and Phone to your helmet via Bluetooth and achieving stereo music via 3.5 stereo plug into phone, all to easy......
So enter a lifeproof phone case.....waterproof (2 mtrs), shockproof etc even with stereo plug attached....($40 to $65), a lifeproof belt holster....($35) a RAM 1" ball diamond plate ($10) & RAM std double B clamp ($16) and a Dremel with a couple of small stainless bolts.
A small grinding job on the rear of the life proof belt holster (and don't fit the supplied belt clip) to make the rear of the cradle flush and attach the RAM plate......another small grind with the Dremel on the holster to allow the charging port on the lifeproof case to open for the charger and your away.....
The conductive touch screen issue is over come by the purchase of a reel of conductive thread ($4) and sow a patch into the tip of your glove on your chosen finger and your done.
Now running Tom Tom or VMS for navigation, music playing, phone connected, SMS readable, iPhone in waterproof RAM mount on the Helibars.....charged via cig plug in glove box.
Thought this may help someone with a similar desire......
Cheers
Chris