Over the years I have wathed many detector companies bandy about the term water proof for their detectors. As a diver , waterproof means that no water will be able to enter the device up to a certain depth. The rulr of thumb has been any device that can be pressure tested to keep water out past 660 ft is water proof. Anything less is water resistant. The Excal is water ressistant to 200 feet which is a admirable feat. It keeps water out from 2 feet down to 200. The new equinox is not waterproof, it is water resistant from what I understand to 10 ft. Experience has taught me that 10 ft water resistance actually means keep it well under the ten ft. It is more likely splash proof. If they keep using waterproof someone will take it diving and find out exactly what depth it starts leaking. Every one wants to say their machine is the best, and yes they have good products, but some truth about the depth not to exceed needs to have some credibility injected into it. . Waterproof is 660 feet, anything less is simply watweproof and attention is rquired when it is used in its rated depth.