took the musky out for a walk , using the 800 coil and it was find until it got into the wet grass then it started to false ya i could still find targets but the falsing was bothering me so when i came in i took the coil cover off . and it was full of wet sand , i washed it out and dried it and put it back on and runs smooth again so it do matter now i taped the seam to keep the dirt out