The use of a less sophisticated sonar

[carpedium]

All - Another question in regards to my new pursuit of salmon/trout from a boat as opposed to a creek bank:

I currently have a Humminbird 300Tx (Tri-beam) sonar. Reading all of the posts on here suggests to me that a large part of this type of fishing is locating baitfish, etc by use of the sonar unit. What is the technique for doing this with a unit such as my own? Will a school of baitfish look similar to a cloud of dots on my unit? Anything else I should keep in mind with respect to using this as a tool?

Any info is appreciated.

Matt

[carpedium]

Is my unit even worth using?

[MarkNY]

hi matt, im not an expert but i have my sonar dialed in pretty good and rely on it constantly when trolling. ill post a screen image from mine marking bait. ive been running mine on 200KHZ and usually have it set around 70-80% sensitivity. that works pretty good for me when fishing deep. hope that helps. best, mark

[joejv4]

That big red blob (blue around the edges) on the right of Mark's photo is typical of what a pod of bait will look like. Depending on your particular graph, the colors will be different (or if it's gray scale), but that's essentially what you'll see.