Range Selection - Furuno 1751 Operator's Manual

Basic Operation
2. OPERATIONAL OVERVIEW
The nearly invisible line rotating radially around the screen is the "sweep." This lets the
operator know that the radar is functioning properly. The sweep rotates synchronously with
the scanner, so at any given time the direction in which the scanner is pointing is known. With
every rotation echoes appear on the sweep as brighter spots of light, thus presenting a
complete picture of the surrounding area.
Placing the radar in stand-by helps extend component life. Therefore, when you won't be
using the radar for an extended period of time, but you want to keep it in a State of readiness,
set it for the "ECONOMY" mode by pressing the
TX
touchpad. Power for the CRT is cut off
after 2—3 seconds and the indication "ECONOMY" lights on the front pane to show that the
"ECONOMY" mode is on.
Range selection
The range selected automatically determines the fixed range ring interval, the number of
fixed range rings, pulselength, and pulse repetition rate, for optimal detection in short to
long ranges. The range and ring interval appear at the top left corner of the display.
*: This distance is from the
own ship's position to
the outermost position of
90° or 270°
Figure 2-4 Location of Range and Fixed Range Ring Indications
To select a range, press the plus or minus sign on the
RANGE
touchpad. Note that it is possible
to increase or decrease the range setting automatically by holding down these touchpads.
Tips on selecting range
1) When navigating in or around crowded harbors, select a short range to watch for possible
collision situations.
2) If you select a lower range while on open water, increase the range occasionally to watch
for vessels that may be heading your way. Remember that the maximum range a radar can
see is dependent on many factors. For further details about maximum range, see the
APPUCATION section.
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