theeqguy
You will probably benefit from Doug Vahrenberg's video site. He has a 9 part seminar demonstrating how to fine tune your unit, he uses an 1197 to demonstrate but it covers all of the SI units. Scroll down on the page until you find the seminars. There are a lot of good videos on his page. I have copied the seminar to my computer using "ANT.com", this way it is easier to review the videos several times without the internet slowing and stopping it.
--->
http://www.dougvahrenberg.com/Videos.html <---
Also Doug is on a site --->
http://www.bbcboards.net/zerouser?cmd=login <--- after you register you can go to "Humminbird Image Interpretation" which Doug takes care of and which there are a bunch of folks who post pictures for interpretation.
Also, on this site is "Images, Snapshots and Videos" which have some very good information.
There are tons of information available, I search through a lot of forums, each site has something to offer, but this is the site I spend most of my time.
Hope this helps
George