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JMA-9172-SA Instruction Manual > 5.OPERATION OF TARGET TRACKING AND AIS > 5.2  TARGET TRACKING OPERATION
3) Left-click 
The Property will appear.
4) Left-click the item button of 
The reference target function will be set to on or off.
5) Left-click the speed sensor switching button in the Own Ship 
Information located at the upper right of the display, and select  
.
The speed of own ship calculated from the reference target will be displayed.
When a reference target is set, the symbol display is changed to  .
Only one target can be set as a reference target.When a new reference target is set, the 
previously set reference target is canceled. 
5.2.7 Operation Test  (TT Test Menu)
The following functions are available for testing the target tracking function:
:A reference target is set.
:The reference target is canceled.
This function is provided to test if the target tracking 
function is operating normally. Thus, do not use the 
function except when you test the target tracking 
function.
In particular, if the operation test mode is used during 
navigation, pseudo targets appear on the radar display 
and they are confused with actual targets.
Do not use the mode during navigation. Otherwise, an 
accident may result.
Test Video Makes an operation check on the target detection circuit.
TT Simulator Generates pseudo targets on the radar display in order to test
if the target tracking function is operating normally.
Status Displays the status of the target tracking function.
Gate Display Displays the gate size for acquiring / tracking a target.