I owl hoot with my mouth in the dark to give me an idea of where the birds are roosted to get as close as possible for my initial set up in the mornings. After setup in the dark, I prefer to the the tom gobble on his own to confirm I'm close enough. Once he does that, I then make the decision to stay put (I'm close enough), or to move in closer. I don't call as a hen in the mornings until about 15 minutes before I expect flydown unless I haven't heard a peep anywhere that morning and plan to just stay where I'm at for at least another hour.
After I'm up running and gunning, and do not know if there are birds anywhere nearby, I'll periodically call with my mouth with a sound that is a mix between a crow call and a peacock. I've found that it produces way more shock gobbles back than either the crow calls I used to own or the peacock calls I used to own. Again, after I get one shock gobble back, I'm closing the distance as fast as possible to get set up to yelp and cluck him into range.
During the daytime, if I know birds are in the area, I don't use any locator calls, slow way down, and move using hen calls only.
Been doing it this way for about 10 years, and seems to work very well. Plus fewer calls to carry with all the other accessories in my bag.