I have had this problem with the Hook units. I've used needle nose pliers to pull them out of the Hooks. The Lowrance 7 is a little different because I think you have to push it down to release it and then it will come out. I would try to push it down (towards the bottom of the slot it sits in) and then maybe CAREFULLY with pliers to pull it out. If it's not releasing at all, I would call Lowrance or take the unit somewhere that does marine repairs.
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