To locate gobblers a diaphragm call is a great tool when used properly and not too aggressively.  Cutting helps to find gobblers after they have left their roost and are looking for hens to attract.  Sharply cutt in about 3 second bursts, stop and listen.  If you hear a tom in an area not visible to you, cup your hand and slowly turn your head while calling on your diaphragm.