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.
Bottom Lines portable Fishin' Buddy 1200 and Fishing Buddy 2500 mount easily to a dingy, fishing tube, or a dock.  There Tournament 4300, Tournament 5300 and the Tournament 6500 are some of the most sophisticated fish finders in the world.
Affordable electric downriggers like the Mini Mag and Magnum 10 (workhorse of the Great Lakes) make trolling with downriggers a pleasant experience.