Abstract: A hull-fitted electronic device (2) for a vessel is provided. The hull-fitted electronic device is adapted to be attached to a seat (10) having a through hole (11), the seat being attachable to a hull (20) of the vessel such that the through hole of the seat is aligned with a through hole (12) of the hull. The hull-fitted electronic device comprises a transducer (16) adapted to generate a signal to be transmitted into the water outside the hull, and a housing (14) encapsulating the transducer and having a lower portion (3) and a flange portion (4). The lower portion and at least the portion of the flange portion located closest to the lower portion are covered by a surface (5) of a material (17) being watertight and transparent to the signal generated by the transducer. A portion of the surface forms a window (13) of the housing arranged to transmit the signal of the transducer.