2-8
Operate the [RANGE] switch and the display shown below appears. Adjust the [RANGE] control
again to select a basic range.
RANGE: 30 ft
Note
: The [RANGE] switch is inoperative when the auto functions is active.
2.7.2
Range shifting
The basic range may be shifted up or down with the [SHIFT] keys ([+], [-]). Press a [SHIFT] key
and the display shown below appears. Press a [SHIFT] key again to select the amount of shift.
SHIFT: 0 ft
Note 1:
The maximum shift range is 1000 feet (300 m). However, actual range will depend on
underwater conditions. In the worst case echoes will not appear.
Note 2
:
Basic ranges can be changed on the system menu [3].
Note 3:
The unit of depth may be selected on system menu [1].
Note 4:
The range cannot be shifted when the auto function is active
.
2.8
Erasing Weak Echoes
Dirty water or reflections from plankton may be painted on the display in green or light-blue.
These weak echoes may be erased as follows:
1. Press the [SIG LEV] key. The following display appears.
SIGLVL: 1
2. Press the [SIG LEV] key again to select signal level (echo color) to erase. Every pressing
deletes the weakest color echoes on the screen, up to the light-blue. You may identify the
deleted colors on the color bar; deleted colors disappear from the color bar. The selected
level is shown as SL1, SL2 or SL3 at the top of the screen. "0" turns this function off.
