Assertion: sonar | /r/HasProperty | ineffective
Facets:
value: generally
type: DEGREE
value: at speeds over about 10 knots
type: OTHER
Source sentences:
text: Sonar was generally ineffective at speeds over about 10 knots, requiring "sprint and drift" tactics in which the antisubmarine warship had to periodically slow almost to a stop to make best use of its sonar.
text: Diagram of a submarine's baffles where its sonar is ineffective.