larry, i had a 2010c for a couple of years, great unit. easy to navigate, etc. i'vr got a gsd20 black box for the sounder unit and a set of manuals, let me know if you need them. also be aware, garmin no longer supports that unit. mine lost the screen and no one would work on it. i also had a 2006c, same thing happened after about a year.
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