also: ソーナー
Refers to the technology or device for underwater detection using sound waves. A straightforward loanword from English.
潜水艦はソナーを使って海底の地形を調べた。
The submarine used sonar to survey the seafloor terrain.
Standard katakana spelling for the English loanword 'sonar'.
Less common variant spelling; the long vowel is sometimes written out.
From English 'sonar', an acronym for 'sound navigation and ranging'.