Hey Hach, WELCOME TO THE WORLD OF WATER TREASURE HUNTING! In response to your questions, I hope you have a long handle water scoop. I use a stainless steel long handled water scoop, which is kind of heavy, but I carry mine over my left shoulder, and also have a dogleash attached to it. So, I don't lose it, wven though you could find it with your metal detector or feet.
In response to the detector, I kind of lean mine against my body, while I'm trying to recover a target. I don't use any kind of line attached to the detector, because you have the headphones on with a cable. But, if you are hunting at an ocean beach, where you have the potential for high waves.
STAY ALERT, PAY ALOT OF ATTENTION TO THOSE WAVES, Especially If YOU ARE WEARING WADERS. They can fill with water very quickly, YOU COULD LOSE YOUR BALANCE,
FALLOVER and POSSIBLY DROWNED! UUSSEE AALLOOTT OF CAUTION!!!
BE CAREFUL WITH YOUR CARKEYS, I wear a single car key on a device around my neck, and tuck it down inside my shirt for added security. Don't want to lose car key, and get stranded. Also, I wear a little container around my neck to put the GOODIES IN, so they don't get mixed in with all the dirty clad coins, fishing sinkers, iron trash, that you will find while water hunting. The device is actually a campground soapdish on a rope, and it works great or you could buy something in any scuba shop, or in any beach supplies store.
Finally, I also use a mesh type treasure pouch on a scuba belt, but you could use any type belt with the mesh pouch. That allows the water to flow thru and possibly wash sand and dirt off your finds.
ABOVE ALL, BE VERY CAREFUL, STAY ALERT, USE A WHOLE LOT OF COMMON SENSE! NO TREASURE OF ANY KIND IS WORTH YOUR PERSONAL SAFETY! LOL,HH. NamVetLesTreasureSeeker