The 997si is color and I had it connected to my Minkota v2 with thru the trolling motor Dual Beam sonar..I would think the Terrova is the same if it has the transducer built in. It works fine and I could power it up before purchase too. Gunna use my 998s in it's place up front now for now.
IF YOUR TROLLING MOTOR HAS UNIVERSAL SONAR2 IT SHOULD BE ABLE TO DO DUAL BEAM SONAR. BUT NO ONE HAS MANUFACTURED DI / DOWN IMAGINING THRU ANY TROLLING AS OF YET...I COULD BE WRONG BUT THE 997 CAN DO DUAL BEAM SONAR WITH UNIVERSAL SONAR2. "Universal Sonar 2 delivers advanced water temperature sensing and DualBeam PLUS technology" DIFFERENT THAN DI..