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  | I just finished mounting mine on an 05 620.  I couldn't mount under the step, didn't have clear soundings horizontially, the bottom of the hull angles downward as you leave the centerline of the boat.  I temporarily mounted mine in several places, I removed my temp/speed sensor which is just above the step and mounted it there and on 3 places on my jackplate.  My problem was trying to get a good signal to the port side while my kicker was down.  Every place I tried I had interference.  I had the best signal below the jackplate, just before the step starts.  In every position I tried, couldn't get a signal over 6mph.    
  
Walleyecentral has a Ton of info on mounting these things on various rigs. I'd check there.. |  |
 
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