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Message: <blockquote data-quote="FuzzyGrub" data-source="post: 521908" data-attributes="member: 3438">If your Terrova has an internal transducer, probably will only work with the HB.  It may be able to network to it, as well.  Otherwise, both will require mounting to the bottom of the trolling motor, which can be a pain managing the cables.If the new Lowrance is compatable with the existing transducer, that might provide some value being able to swap back and forth.  But, with only 1" difference in sie, maybe not.If everything else is equal, the larger screen would win out.  At the console, usually running with a GPS splitscreen.We have a bow mount hook-up for an old HB.  It uses the 2D sonar in the trolling motor.  For our shallow water fishing, don't bother to plug in, most of the time.  When we do, it is just on the 2D screen with "large" digits enabled.  ie it is just used for depth.   Deeper water verticle jigging, it is nice to have.Bow mount is usually further away from your eyes, so details might not be clearly seen.  Also, don't want to mess with it that much, bending over to adjust.Might also consider a 2nd station for it at the console.  You can run it full gps screen and use the larger for 2D, SS, or DS.  ie get more use out of it vs just pan and bass fishing.  Depends if you have the room at the console.</blockquote>