I have a Lowrance X47 next to the console on my boat...and being completely honest I'm terrible at reading it.  Can anyone give me some tips on the best way to read the type of bottom structure I'm looking at on the graph.  Does it show up as a dark line if its hard and rocky? etc? I know the graph isnt a real high tech one, but id love to be able to be able to pick out drop-offs, bottom type, etc. and at this point about all i do is read water temp and depth.

I suspect that you have had no responses is because there are very few people who are familiar with your particular unit.  My suggestion is that you log on to www.lowrance.com.  Lowrance has an excellent sonar tutrorial.