On my 337 I track my down rigger balls just fine with the 200 frequency, worked great right out of the box with the arches, etc.
Did you know if you want to swith to which screen is active in split screen mode all you do is hit pages twice and it switches active screens for any afjustments, zoom in/out, etc. etc. Maybe you did but I thought that was a great feature, not all Lowrances do this.
What I like most about Lowrances is just about all models have the same menu set up, so there is not a whole lot of re-learning if you upgrade.