Don't wait for calm water, waves are just part of the deal. I use the side of my foot instead of my toes because I kept cutting the toes off from my water shoes, along with hide occassionally. But the principle is the same. Actually the side of your ft may be better with the at pro because it has a double d coil and pinpoints off the toe or heel of the coil. Once you have determined where the target is put your scoop in behind or beside your foot and take a bite, remove the scoop and check the hole, if the target is gone its in your scoop. If its still there rotate around the hole 90 degrees and try again. Keep rotating 90 degree's with each try. This helps when the target is stuck in the side of the hole because the point of the scoop scrapes a different side each time you rotate. Always remember to double check your holes (may be more than 1 target) and always check any bottom that you may have dumped off to the side before refilling your hole.
If you're hunting in water that has sand ontop of heavy clay/marl try scooping just deep enough to get the light stuff off from the top usually targets have to have been there along time to settle into the clay/marl. And you will quickly find that it takes a long time to get the clay/marl to break down in your scoop. (you can help this by making sure there is some gravel mixed in)
I have found that it is very important to get the target on the first scoop when you can. Usually if you don't get it on the first try it will take several more. If you hunt in deep sand like Lk. Mich. you can loose targets by missing them because the sides cave in to fill the hole almost instantly and if the target falls to the bottom of the hole you just scooped it could be out of range for your detector. I always make several attempts even if I have lost the target just in case.
Steve :-)