a dongle couples an electrophysiologic catheter and a navigational system , including a patient interface unit . the dongle permits hardware normally carried on catheter control handle to be relocated onto the dongle to render catheter “ greener ” and less costly to manufacture use . the dongle having a support portion with flexibility , shape memory and / or varying degrees of stiffness also advantageously allows a user more control over the placement , position and orientation of the dongle . the dongle has a body with a first electrical interface unit , and a support portion with a second electrical interface unit , the support portion having an outer flexible tubular member with shape memory . in one embodiment , the support portion comprises a gooseneck tubing . in another embodiment , the support portion comprises a coiled spring .