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we have a cheap garmin e-trex GPS but our kids like the thrill of the hunt..we have found some good small ones from the beginning..like a metal gum tin with a magnet in it stuffed inside the middle of an old canon
some people are really hooked..we do it when we get the time
our gps s ok..gets us to within 3-4m - its then a case of digging around..we have about a 85-90% success,,some are missing or really hard to find
i think the iphone GPS should be adequate for your needs..interference from i don't know what (alien invaders) or atmospheric conditions is a big factor we have found
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