Having decided to focus my search for new electronics to Lowrance I now find an incredible array of options.  LCXs, LMSs....  I get tired thinking about how to crunch all this so need some input.<br />I basically need dual frequency and I need feature that plots surface temps over the last 10 (or whatever) minutes.  I don't need color (I don't think) and question of combing with GPS is posted previously.  Is there any straight forward way of sorting through all these models?