  {|    |} the echo-class is a class of multi-purpose hydrographic survey ships in commission with the royal navy. the ships are primarily tasked with conducting survey work in support of submarine and amphibious operations, however, the class also has a secondary role in mine countermeasures. the two vessels of the class are the most recent additions to the royal navy's hydrographic squadron. each ship displaces approximately 3,700 tonnes, and is
Survey_ship_classes Survey_vessels_of_the_Royal_Navy