hi, i was wondering if u guys can help me.. I'm the process of purchasing a sand shark, or vaquero with 15x12 S.E.F. ok so the shark is a P.I. unit and primarily made for a sandy beach, vaquero is an VLF with built in discrimination mode that i can-not take in to the water, however i was wondering if anyone owned one that took it out to a wooded area or some-thing in the range or an large play ground or a football field. become from what i understand even with an 10 inc concentric coil (the whites P.I. dual is an 12 inc mono, but out of price range) there-for the shark will go deeper then vaquero 15x12 S.E.F. (p.s. i plan on digging everything accept for playgrounds or high trash area any way). so if anyone used the shark in the field please let me know how well it does, thank you.