I do currently live on the beach in Florida, but travel for work. Never know what terrain I'll be in. The one person I've run into with a detector told me that the multi-frequency makes a world of difference, of course he was using a PI machine. I'm so lost.
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SMF (simultaneous multi-frequency) detectors like the Apex, Vanquish or Equinox do make a world of difference compared to single frequency VLF detectors like the Simplex or Bounty Hunter you're using. It allows you to search more areas than a single frequency detector, such as salt water beaches. It also provides (in general), more accurate target IDs in a wider range of soil conditions.
Some VLF machines (like the Simplex and AT Max) will work at a salt water beach. However, they will be chatty (noisy), you'll need to ground balance often and they won't go as deep as a SMF machine.
So what about a pulse induction (PI) machine? Well, they do really well in hot or mineralized ground, such as salt water beaches (can go deeper than most SMF machines, I believe) and places where you might be looking for gold. So what's the catch? They're usually heavier and bigger than VLF machine due to the power consumption needed by the PI tech. Also, they have limited (if any) discrimination ability. This is a CRITICAL feature needed to hunt in places where you might find trash, such as a park or yard.
Basically, when using a PI machine, it will beep any time it hits metal, and there's no way to notch out any unwanted targets (at least not as well as with a VLF machine). So if you want to use a PI machine in a typical park, it will never shut up and all you'll be doing is digging trash for the most part. Cherry picking is not realistically possible with a PI machine. At the beach, this isn't really a problem, as trash isn't as prevalent as a park or yard.
So if you want the best "do it all machine" you want the Equinox.