I have an Ipod Nano 5th generation and use a Sony Bluetooth Dongle Model # TMR-BT8iP I got at Amazon. It connects wirelessly to the F4 and works relatively well. I have a a Zumo 550 but I only have my Blackberry connected through that to the F4. I have no complaints about this set-up. YMMV...
First Rule of Trauma: All bleeding stops eventually.