One aspect of the invention relates to a method of detecting a spatial orientation of a transducer by a handheld optical scanning device. The method comprises steps of providing a first spatial orientation feature on at least a first outer housing surface of the transducer and arranging a handheld optical scanning device in a sightline of the first spatial orientation feature at a selected spatial orientation relative to the first outer surface of the transducer housing. The method comprises further steps of identifying the first spatial orientation feature, detecting a spatial orientation of the handheld scanning device in a predetermined coordinate reference system and determining a spatial orientation of the transducer in the predetermined coordinate reference system.