Bottom Line Fish Finders 

& 

Cannon Downriggers!

The Tournament 4300 The multi-directional transducer provides side and bottom images, records water temperature and boat speed. One transducer and one screen - providing highly detailed multiple views to the bottom and side and digital displays of the water's surface temperature, depth and boat speed.
Bottom Line Depth Finders have been a leader in the industry for decades.
Affordable electric downriggers like the Mini Mag and Magnum 10 (workhorse of the Great Lakes) make trolling with downriggers a pleasant experience.