Just posted this message under another post-guess I need some more coffee. From that post it mentioned the sea water setting. I went to the beach yesterday, set my mode to beach and tried to edit to sea water but the machine just squawked at me. What am I doing wrong. Just wondering if I only detect on the dry sand would the coin mode work okay? I used the setting that were previously suggested and while hearing many signals and digging either I was hearing things are nothing existed. I pulled up some junk and walked away with one penny. Thank in advance for any suggestions-you guys are great!