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Message: <blockquote data-quote="Seabob" data-source="post: 142016" data-attributes="member: 779">[USER=497]@GPSguru[/USER] Thanks for the reply, I see that the GT8 and GT15 are 8 pin and the unit is a 4 - an adapter is required as you say.  Suppose I was interested in the increased frequency range over the standard supplied transducer (which is 10 KHz).  The GT8 has a range of 85 kHz.  Would that make a big difference when trying to locate target and bait fish?  Just wondering if the image would be a lot clearer. I mostly do inshore fishing because it's not a big boat.</blockquote>