Humminbird Wide 3D View Operation Manual page 31

"ID+", the default setting, provides more information about the location of the target by attaching
depth "strings" showing the digital depth of the target. When there are numerous targets on-
screen, not every target depth is shown, to avoid excessive clutter on-screen.
ID "Off" disables the units interpretation of targets, and displays the "raw" sonar information as it
is received. Advanced users may prefer this type of presentation, so they can make there own
interpretation from the information displayed.