I prefer it over the 4.5" Crossfire for depth and ground coverage. I currently have 4 coils that fit this machine and have tested them all extensively. 4) Power-Master circuitry puts this machine head-and-shoulders above the earlier "Ultra" series. Pinpointing is done with the heel or toe of the coil. After determining the type of coil that is best for your type of hunting, the next thing to consider is the size. The AT Pro does not work well in salt water. The AT Pro is easy to work and does what it says it will. I have dug coins in soil from 8 to 10 game hd pc 2012 inches. COIL SIZE WILL AFFECT THE DEPTH OF THE DETECTOR BUT MAY NOT BE SUITED FOARTICULAR TYPE OF HUNTING. ENVIRONMENTAL FACTORS INCLUDE JUST ABOUT EVERYTHING EXCEPT THE DETECTOR AND COIL. JUSEW OF THE THINGS TO TAKE INTO CONSIDERATION ARE THE FOLLOWING : SIZE AND SHAPE OF. The only dislike is that garrett could have found a different color for the ace other than bright yellow. HH Max Depth: 6 inches on US quarter Overall Rating. Durability Ease of Use Would you recommend this to a new user?