I have a Vex FL8-SE that quit showing me the bottom and my bait. I suspected the transducer was not working so I put the one from my buddies Vex on my machine and it started working again. So now I find myself needing a new one. I did some looking and find they have 12 or 19 degree ones. I don't know which one I have so how do I tell what one to buy? What are the differances? Also, i could use some help finding a good deal on one. Thanks and tight lines to you all.