congrats on upgrading to the explorer! a couple hints: when hunting parks, hunt in conductive only! NEVER use auto-sensitivity. REALLY try and learn to use the smart screen. finally, when swinging, investigate ANY high-pitch change in tone, no matter how soft. the tones on the explorer don't lie. if you get a soft (low in volume) high pitch signal to repeat, dig it! at first you may chase some iron, but eventually you'll be able to tell the diff. between iron falses and deep coins. the deeper coins will not be "in your face" sounding signals. they will be subtle, but once you learn what you're listening for you'll be amazed at the depth. you'll also be amazed at all the silver you'll find in areas where you were sure you "got everything".
one more thing: be sure to heed Dan's advice. he sure knows what he's talking about. i'm lucky to hunt with him weekly, and he has taught me SO much about the explorer, which i've had since june of '07. the best way to learn what the deepies sound like is to hunt with someone like him and have him let you listen to deep signals that he has found. i've watched that dude pull tons of silver out of the ground! if you ever have a chance to come out to california, a hunt with dan, or anyone who knows the explorer inside and out, will help you TREMENDOUSLY!
good luck! i can't wait to see you start finding multiple silvers and wheats...you'll be in heaven. be patient!
HH,
Mike