farmer56 here ... first post ... buying a fcv628 unit soon .... i fish out of a 1987 lund pro-pike aluminum boat with a 30 hp. yamaha tiller .... i fish only fresh water minnesota and ontario ca. .... target fish walleye pike and northern pike some pan fish .... most of the time 30' or less ... what transducer would fit my needs best .... p66 or tm258 .. i mostly troll slow .... thanks for listening hope this finds you all well ... farmer56 out