What am I looking at?! New to SONAR.

[GreenEYESfromOHIO]

I have been scouting my lake with my new DEEPER portable fish finder that I troll behind the john boat. It is my very first ever fish finder and am excited to have one! I love to crappie fish and I know finding structure is vital to finding the crappie. I took these two pictures of what I was seeing on the sonar and being new to this, I'm not sure what the heck I'm looking at!

The first image (A) is a blowdown tree from shore going about 20-30' in the water. The manual says green denotes grass/weed but that is not the case as I know for a fact this is a huge tree. Not to mention you can actually make out the limbs. But what is that orange blob to the right of that?

A.


This second image (B) is something I came across just slow trolling around. If I had to guess I would say brush/tree but I dont see any distinguished limbs or branches. This was no blowdown, wasn't close to shore. Also notice im in 10.5' of water, whatever that is it's near the same height! It is also right on a small drop off, should of been a smokin crappie spot but I caught nothing on it. Also, I know fish..well at least crappie show up as arches on the sonar, it said it was marking fish but I only see one nice arch, thats the one far left, but it looks unusually large for a crappie! I want to say my sensitivity was set around 85-90%. Guess I'm expecting to much in terms of detail. Need your experience here fellas! Much appreciated!

B.