Best Frequency Coil

[ysbytymike]

I apologize if this has been covered in the past but a search with keywords hasn't come up with the info I'm looking for.

What is the best frequency coil to use on wet sand? I understand that dry sand is not that different from soil as far as coils are concerned
but still unsure which frequency coil would be better for searching below the high tide mark.

I currently own two coils. ( 7.5 and 18.75 kHz.)

Cheers 

[Chef Geoff]

7.5kHz Mike, the 18.75 is a fantastic coil and one I used as standard but far to sensitive for wet beaches.

[ysbytymike]

Cheers Geoff..