Bottom Line Fish Finders 

& 

Cannon Downriggers!

If your looking for a fish finder, Bottom Line has a model for you.
For the ultimate experience, link up the Magnum 20 Digi Troll or the Digi Troll IV with Bottoms Line NCC 6500 and control your downriggers right from your fish finder.
Affordable electric downriggers like the Mini Mag and Magnum 10 (workhorse of the Great Lakes) make trolling with downriggers a pleasant experience.