I just put a 998 on my rig and I mounted the transducer on the left side of the outboard because I have an existing FF and figured a back up would be smart just in case I took it out today and it seemed to do well ID a lot of structure and marked a lot of fish caught 2 cats trolling in the river by the house. I put a troll-o-matic on the outboard and it works great but it seems to send turbulance and make the SI on the left side show a little fuzzy if I turn sharp to the left and every once in a blue moon if I take off and plane out it will give me an alarm and say I'm in 1 FOW and then go to 75 to 80 FOW when I was only in 24 fow. I think it's alright but if you guys know of something I could change or adjust let me know works great at 30 mph as well as .7 MPH except for the once in a blue moon and all I do is let off the throttle and let it catch up and take off again and it's fine sooo I don't know maybe normal this is the first DI and SI unit I've owned. Any advice or info would be greatly apprieciated.