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What a great Raffle! I will be purchasing some tickets!

I have a hummingbird 997, I think I got sold a lemon. I bought it used off of here and its got quite a bit of hourson it, when its on for a few minutes the screen will either freeze or go into a...

Will 997 SI sync with a 999 SI unit? Will all the 900 series sync? Or does the end number have to be the same?

Thanks Guys, I'm not really feeling drilling a hole in my boat if that's what it takes, it wont let me post pics or I'd post one of the transducer.
I have a 2003 Charger 496

Just bought a Humminbird 997, came with a through hull transducer, little leary on drilling a hole through the boat for this?
Can anyone give me pros/cons of through hull vs surface mounted...