Modes of Operation

screen, showing the distance behind the boat. If the speed/temperature sensor is not plugged into the X-70A 3D, then none of these will show.

The X-70A 3D shows a sonar picture of the underwater world in 3D, 2D, Bottom Depth View, and FasTrack™ modes. The 2D and Bottom Depth Views can use either the 384

or 192 kHz transducer (if the optional 192 kHz transducer is attached). The 3D mode is al- ways 384 kHz. To switch be- tween the different modes, first press the WINDOWS key. Press a key on the left side of the screen to choose the de- sired mode. Press the CLR key to exit this menu.

In the 3D mode shown at right,

the bottom is represented by a “wire-frame” model. Only the bottom and fish symbols show in this mode. Structure, weeds, thermoclines, etc. will not show.

The X-70A 3D uses a 384 kHz transducer with four elements. The digital depth display shows the bottom depth from the middle transducer ele- ments. If it loses the signal from any element, a box with the word “LOST” appears over the corresponding area on the display. This means the unit cannot receive an echo from that element. This could be due to a large drop-off, noise or other natural phenomenon.

The 2D mode looks like a conventional sonar display as shown below. The bottom echo scrolls from right to left. The range displays on the right side of the screen. The digital

bottom depth shows in the upper left corner. When the X- 70A 3D is put into the 2D 384 kHz mode, the two center transducer elements are in use. The two outer elements are turned off. You can select the elements from a menu dis- cussed in a later section. The

2D 192 kHz transducer has only one element.