As standard my various Bluetooth headsets and car adapter only allow me to answer and make telephone calls with the phone.  I’ve thought for some time that it would be really good to be able to use Bluetooth with the phone’s SatNav applications and I’ve found a really simple solution for this by using the free ‘Mono Bluetooth Router’ application downloadable from Google Apps.  This is a great way to either increase the SatNav volume when used with a Bluetooth car kit or to enable SatNav audio when using a Blutooth headset with a motorcycle helmet.