JMA-9172-SA Instruction Manual > 2.CONTROL PANEL KEYS and SOFTWARE BUTTONS> 2.3  FUNCTIONS OF SOFTWARE
BUTTONS
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  Past position display true / relative switching
The tracked target / AIS target past position display is switched to    (true past 
position) /   (relative past position) whenever the button is clicked.
This setting is switched together with the target vector display true / relative switching.
  Past position display interval switching
The past position display interval is switched whenever the button is clicked.
  Past position display interval unit switching
The past position display interval unit is switched whenever the button is clicked.
 ⇒   ⇒   
  AIS On / Off
The AIS display is switched to On / Off whenever the button is clicked.
  Tracked target symbol display On / Off
The tracked target symbol display is switched to On / Off whenever the button is 
clicked. Use this function to avoid confusion with the AIS symbol.
  AIS target symbol display On / Off
The AIS target symbol display is switched to On / Off whenever the button is clicked. 
Use this function to avoid confusion with the tracked target symbol.
  Association On / Off
The tracked target / AIS target association is switched to On / Off whenever the button is 
clicked.
  AIS filter mode switching
The AIS filter is switched whenever the button is clicked.
  ⇒   ⇒   ⇒   
  Radar trails display true / relative switching
Radar trails are switched to   (true motion trail) /   (relative motion trail) 
whenever this button is clicked.
This setting is restricted by the radar display motion mode.
In relative motion display mode (RM), switching to   /   is possible.
In true motion display mode (TM), only   can be set.