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3.4  Basic Operation 
3.4.1 Transmitting [TX/PRF] 
(a) Press the [TX/PRF] key. 
  The standby state is changed to the transmitting state. 
3.4.2  Halting transmission [STBY] 
(a) Press the [STBY] key. 
  The transmitting state is changed to the standby state.    The screen displays "STBY." 
3.4.3  Changing the range [+RANGE-] 
(a) Press the [+RANGE-] key. 
  Pressing the key on the + side increases the range. 
  Pressing the key on the - side decreases the range. 
3.4.4  Erasing/displaying the fixed range marker [RR/HL] 
(a)  The fixed range marker is turned on/off each time the [RR/HL] key is pressed. 
3.4.5  Erasing the ship's heading marker [RR/HL] 
(a)  The ship's heading marker is not displayed while the [RR/HL] key is held down. 
3.4.6 Tuning 
See 3.2.2, "Tuning [AUTO-TUNE]." 
3.4.7 Adjusting sensitivity [GAIN/PL] 
(a)  Sensitivity adjustment ([GAIN/PL] control) is not necessary for general use. 
 The [GAIN/PL] control is always set to the maximum (turned fully to the right). 
  However, if many noises appear on the screen, turn the [GAIN/PL] control to set sensitivity 
for easy observation. 
 
 
 
Caution 
 
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● If the set sensitivity is too low, the target of a dangerous object or ship may not 
be displayed. 
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● In some cases, if the set sensitivity is too high, the receiver noise on the radar 
screen increases and interferes with the observation.