Mine is so precise, that the problem I have, is the difference in the puck location for my Humminbird units, and the internal antennae in the Lowrance unit are about 12 ft apart. If I marked a pile with my HB unit, then transfer those coordinates into my Lowrance, then my anchor point is 12 ft off my brush. Then I have to factor in my Transducer location. I use the 5' jog features on the lowrance unit to position my boat to view the brush pile on my 2D, then drop a buoy near my transducer and fish around the buoy. I am very impressed with the technology in this setup, but still prefer the HB imagining features, and despise the fact that Lowrance cannot be purchased as a "Turnkey" unit. The Imaging transducer has to be purchased extra, takes a separate purchase for NMEA 2k kit, separate purchase for Gateway to MG, and on and on. I also like the ability to manage my waypoints on my desktop with Humminbird PC. If you have a large number of points, you have the ability to edit them, manually enter, etc on your computer, then load back in the unit.