So MT, I'm kinda new at this so maybe you can explain.  It seems to me if I'm trolling that there's two things I want to know most of all.  First, at what depth am I most likely to find the specie I'm fishing for - say I'm going for Lakers, i'd want to know at what depth 48 - 53 degrees is (all things being equal - structure etc.)  Second, once I've found the prime depth, I want to know if that's where my bait is running.  I don't understand how a line-counter reel can really tell you either of those things.  I get that a line-counter will help you duplicate.  In other words, one you've located the fish a line-counter can repeatedly put your bait back in the same place but how does it help you locate the fish in the first place except by trial and error?