I use a line counter reel, and do so for duplication. It is NOT necessary to run at the depth lakers inhabit. Most frequently, baits will run shallower, but they will come up to hit it. I seldom mark them on my depth finder, but use it to mark depth & bottom. Frequently, they will come in from the sides or other directions. Flash is usually the key. Color of the day is also important. The relative brightness of the sky will help you zero in, along with trial and error color selection.