For about £70 I got a working sat-nav set up using iphone.
App
The nav app is called Skobbler http://itunes.apple.com/gb/app/gps-navi ... 40711?mt=8 . Including downloaded maps for Europe and the UK it cost less than £10 and worked extremely well. Iphones have built in GPS and as long as you have the maps downloaded to the phone it will operate off-line so no worries about data roaming charges. The app crashed twice but this was in over 2000miles of continuous use. The maps are basic, but comprehensive and the realtime GPS response was very good- I didn't miss a turn. It keeps the phone lit-up while it's running, so a charging solution is a must. For the price - it's more than a bargain. I used a bluetooth headphone adapter around town - only has about 3hrs battery life, and wired headphones on longer stretches. As long as you remember to unplug yourself when you get off the bike it works fine.
Charging
Used cheapest possible cigarette lighter type accessory socket. Attached it to the back of the ignition barrel with the supplied cable-ties. I put a 2amp usb cigarette lighter plug adapter into the socket and bingo- phone charging cable plugs in, and the position of the plugs is kept out of the weather mostly under the screen. I'd recommend getting a more expensive accessory socket with an on/off switch. I removed the whole phone and unplugged the adapter whenever the engine wasn't running, so no worries.
Case and Mount
I bought a waterproof iphone specific case bundled with a stem-mount http://www.buybits.com/Product/10648/Ap ... 10648.aspx
It works really well - the waterproof touch screen especially, though obviously you can't operate it with gloves on, but a cheap stylus solves that. The stem mount was secure , but also easy to get the phone on and off. It's not an ideal position to look at - too low - but the instructions from the sat-nav app mitigated this.[/u]
iphone sat-nav outfit
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