The problem isn't in two different devices like th Garmin and headset, it's when you have multiple devices like multiple bluetooth headsets and they don't automatically reconnect. For example. I have 4 different bluetooth devices I connect with on a regular basis: Parrot 3200LS (handsfree), Plantronics 645 (handsfree), Plantronics 655 (handsfree), and BlueAnt Interphone for the motorcycle (Handsfree). They ALL use the handsfree profile. On the i730 I was able to have bluetooth enable, and then just bring one of the devices that is paired within range and it would reconnect, and I could use it. When it went out of range, or I turned it off, I could then bring any of the other headsets on/in range, and they would automatically connect.

With the i760, you have to go to the Bluetooth settings, headset tab, click on the headset you want, click "Connect Handsfree" and then it will connect. As long as you continue to use the same headset, it will connect each time (well it works this way about 50% of the time for me). So every time I use a headset while sitting at my desk, then go out to my car, I have to manually tell it to switch to my car's bluetooth, instead of it just working, like it does on my i730, RAZR, and EVERY other bluetooth enabled device.

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-Michael
Need help setting up your i730/i830 or other WM2003/WM5 Phone, as well as the other hacks I have done, check out the MRailing Guides and Links