Navigation with bluetooth headset

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I looked in several threads but find no answer.
Is there a way to have my navigation on a bluetooth headset ( normal -no stereo)
But find no way to do that- I know it is possible- if i get a call during navigation i get both to my headset.
Is there a app or a hack for this ?- Or am i to stupid ? ( In the Bluetooth Options i can only select Audio)
Hardware : plantronics 925 ( a2dp) headset
HTC desire rooted
asus transformer rootet
Kind regards
gandalf

EDIT: found a solution: app: superBT Mono FRoyo--- ! but works--- not ---- perfect.

edit 2: Works with htc desire-but not perfect- the paid version not always work-no reply from the developer. works not on my tablet.[/QUOTE]

great i was also looking for this. thx for sharing it.