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Mick the Chip
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on difficult beaches its always going to be a compromise
things that help
swing the same Hight above the ground
smaller coil if you have one
swing higher above the ground.
adjust ground balance, not applicable to your detectors
its a matter of experimenting until you find a combo that work well enough to detect
pebbles on top of sand may not be detectable. Most rockpools will be undetectable.
A few beaches near me have a soft black rock dumped on them to stop erosion. They gets smashed into millions of little pieces which all give a good tone
luckily there not everywhere and moving a hundred yards down the beach and your good to go again.