The most common and most likely answer to this crossword clue is the 5 letter word ASDIC which also is the latest solution we found used in Boston Globe in 2009.
Early sonar, to Brits crossword clue answers
Here's a list of possible crossword answers ranked by the most likely to least likely.
| Answer | Likelyness | Letters | 
|---|---|---|
| ASDIC | 100 % | 5 | 
Words with a meaning similar to the clue: Early sonar, to Brits
These words may or may not be a possible solution to this crosswords clue.- asdic
 - dorsal
 - prothesis
 - yogh
 - counter
 - echo
 - ping
 - pinging
 - radar
 - blip
 - scan
 - sound
 
Crossword Answer definitions
More crossword clues leading to the same solutions
Here's a few more crossword clues - all leading to the identical solution