when you mount in hull ,first you must sand and clean the area w/ acetone let dry then lightly scuff the transducer even with a scotchbrite. Then a puddle of marine silicone make sure there are no bubbles in puddle ,go slow and keep nozzle in puddle that way you'll be sure there are no bubbles.
I made the puddle about 3/4" wider than the transducer and about 1" thick and pushed the transducer in made sure the complete bottom of the transducer was in silicone(sunk in 1/8 ")
level front to back and side to side.
there is another forum regaurding this topic the plus and minus
of in hull mounting PM me and I'll give you the info how to get it.
Good luck LINK SR.
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