Navigation aid (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">navigation aid</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for radar that I've seen before include "Method of detection" , "Equipment for locating objects" , "Locator that uses a microwave echo" , "Radio device for tracking distant objects" , "System for detecting things using radio waves" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">navigation aid</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sonar that I've seen before include "Echo-location system" , "Echo-sounding equipment" , "Underwater location equipment" , "What a near-blind creature uses" , "echo device" .)