I've got the Navionics chip in my Humminbird 786ci. I love it. I don't think it is completely necessary for Big Lake, but it sure makes my GPS display purdy. I have benefitted from it though and I recommend it to anyone who is willing to pay the price tag for it. It is very accurate and helps with navigation moreso than fishing, but I was surprised to find a couple new fishing holes with it. Pretty cool little chip. Has great detail for the inland bays and waterways along the gulf coast.
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