Just got a Helix 5 SI GPS as a gift and i'm trying to decide if I want to upgrade from the stock transducer (XNT 9 SI 180 T) to the HD transducer (XHS 9 HDSI 180 T). Anyone out there tried both transducers and able to comment on whether or not the resolution improvement is noticeable on the smaller screen of the Helix 5 (800H x 480V, 5" 256 color display)?