Australian Karen Jacobsen, navigator voice for the Garmin GPS, joins the Manhattan cabaret…

To anyone with a GPS system, a singer opening at a Manhattan cabaret next week may sound familiar.

Karen Jacobsen, who will be belting out ballads at the Laurie Beechman Theatre on 42nd St., is the soothing voice that tells Garmin owners when to make a turn.

She began lending her sound to global positioning systems a decade ago – but hopes to make the leap from the road to road shows.

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