Guys,

I need to increase my knowledge about fishfinders. Not looking for
"sonar hits the fish results in a dot" but in detailed stuff,
technical things, tips tricks and such .... Stuff like what objects
cause what returns under which circumstances.

I have a Garmin 240 Blue, also am looking for users of this unit.

I couldnt find any really good info on the web, does anybody have any
links or knows about literature?

But maybe there isnt any more to it

Matt