Hello, I just purchased a Garmin 498C and I was wondering if anyone of you could point me to articles or a book about the basics of using any finder. I would like to read on interpeting what I am seeing and how to mark points and or dropoffs.

Hey I got this from a friend, it is from Lowrance, but helped me a bit;

http://www.lowrance.com/en/Support/Tips-and-Tutorials/Sonar-Tutorial/

From this very site there are articles to check out. Look over this page there's some good stuff there.

http://www.bassresource.com/fishing/features.html#equipment

Suggestions:

From the "King of Sonar"

Finesse Bass Fishing and The Sonar Connection

Don Iovino

www.iovino.com

Don is a great guy and he as forgotten more about sonar then we know.  Tell him that "Sam in Richmond" says hi.

Understanding Sonar. A DVD from Auten Interactive.

www.bassbytes.tv

Excllent introduction to sonar.

Yup, if structure fishing is your deal.  Iovino is your guy.  Look his DVD up and buy it.  Good stuff!!