I didn't use my offset because I couldn't keep the depth adjustment knob tight enough on my Minkota Maxum with the longer shaft. I would adjust or tighten it and it eventually would always slip deeper so I didn't want to mess with setting the offset since the depth of the trolling motor was going to change. It would read apporx 3 ft shallower than my graph on the transom when it was all the way down with the longer shaft.
After damaging the shaft the repairman said he could just shorten the old shaft by about 2 inches by cutting off the cracked end of the old shaft so I wouldn't have to buy a new upper shaft. Now the trolling motor sets as far down as it can go so I could utilize the offset feature on the Lowrance but probably won't due to my indolent nature.
I've always just watched my jigs on the graph and would run them at the same depth as I was seeing the fish marks on the graph.
“There is no difference between communism and socialism, except in the means of achieving the same ultimate end: communism proposes to enslave men by force, socialism—by vote. It is merely the difference between murder and suicide.” Ayn Rand