S-1 
1 INTRODUCTION 
 
1.1 Read Me 
 
About this manual 
See the INSTRUCTION MANUAL for details. 
Maintain this SIMPLIFIED MANUAL so that operators can refer to it at anytime. 
 
About radar equipment
 
Use the radar only as a navigation aid. The final navigation decision must always be made by the 
operator him/herself. Making the final navigation decision based only on the radar display may cause 
accidents such as collisions or running aground. 
 
About sea clutter suppression
 
When using the sea clutter suppression function, never set the suppression level too high canceling out 
all image noises from the sea surface at close range. 
Detection of not only echoes from waves but also targets such as other ships or dangerous objects will 
become inhibited. 
When using the sea clutter suppression function function, make sure to choose the most appropriate 
image noise suppression level. 
 
About rain/snow clutter suppression
 
When using the rain/snow clutter suppression function function, never set the suppression level too 
high canceling out all image noises from the rain or snow at close range. 
Detection of not only echoes from the rain or snow but also targets such as other ships or dangerous 
objects will become inhibited. 
When using the rain/snow clutter suppression function function, make sure to choose the most 
appropriate image noise suppression level. 
 
About target tracking (TT) function
 
Use target tracking function only as a navigation aid. The final navigation decision must always be 
made by the operator him/herself. Making the final navigation decision based only on tracking target 
information may cause accidents. 
Tracked target information such as vector, target numerical data, and alarms may contain some errors.   
Also, targets that are not detected by the radar cannot be acquired or tracked. 
Making the final navigation decision based only on the radar display may cause accidents such as 
collisions or running aground.