I just got my new shiny Helix 9 SI/GPS and am pumped about it! It's HUGE compared to my 899! Now I have a question. How do I upgrade transducer? Where do I mail it? How much? How long does it normally take (ballpark)? I was told to never take it out of its plastic wrapper. Mine came in the box with the rest of the stuff but....it was not in its own plastic wrapper. Thanks in advance for any advice!

