Bottom Line Fish Finders 

& 

Cannon Downriggers!

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.
Digi Troll IV Designed for serious sport fishermen who demand the ultimate in downrigger technology. Digi-Troll IV is equipped with Positive Ions which allows you to attract more fish by creating a field of positive ions around your boat.
If your looking for a fish finder, Bottom Line has a model for you.