I was talking to a gentleman at a store that sells detectors and he was telling me that they have a coin test garden and the E-trac will detect coins up to 4" deeper than the Explorer. I thought the E-trac, Explorer and Safari had pretty much the same depth capabilities with the difference being discrimination and separation from adjacent iron targets. Any input would be appreciated, as if this is true, I would definitely move up to an E-trac from my Safari.