Here’s those sonar DVDs Doc mentioned:
http://jollyannsales.com/GPS/lowrance_dvd_doc_samson.htm
Like Doc said the sonar DVDs are good for any unit you run. I’ve watched them myself more than once and they are definitely worth watching.
And VC, Jolly Ann Marine has that HDS-5 at a heck of a nice discount price. You do have to look in the shopping cart to see the final sale price after discounts, but it might be worth you while. That is, unless you have a bunch of Cabelas points to spend. I just spent a couple hundred on some cranks and plastics. Gotta love those points!
Anyway, here’s the link if you want to check the pricing. Again, the discount price will show in the shopping cart only: Jolly Ann Lowrance HDS-5.