Zac - Unless you have a cored hull, go with the P79 or similar.I have a Seacraft also and get great readings at 40 mph. Hooper may be right in most cases, but when you're haulin ass to your spot, it doesn't hurt to see a huge pod show up in 30 feet of water either. Last time I checked I still had nads, but a thru - hull concerns me if I should hit something.
A shoot thru is as easy to install as a transom mount. All you do is epoxy or 5200 this little cup to bottom in the bilge, and pop your ducer in. At least with my GArmin unit, this setup works well.
Bill
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