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HELRAS or the Helicopter Long Range Active Sonar is a naval helicopter undersea sensor, a dipping sonar (a form of towed array sonar), deployed by helicopters of many naval air forces around the world to detect submarines; it is a form of geophysical MASINT.
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system sonar helicopters submarines helicopter active detect also bendix light made fitted long range naval undersea sensor dipping form towed
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| HELRAS | is a | Low Frequency Active Sonar | 0.90 | text |
| Italy | instance of | and AS565 with helicopter of navies | 0.80 | text |
| Turkey | instance of | and AS565 with helicopter of navies | 0.80 | text |
| Greece | instance of | and AS565 with helicopter of navies | 0.80 | text |
| Netherlands | instance of | and AS565 with helicopter of navies | 0.80 | text |
| Canada | instance of | and AS565 with helicopter of navies | 0.80 | text |
| Singapore | instance of | and AS565 with helicopter of navies | 0.80 | text |
| Thailand | instance of | and AS565 with helicopter of navies | 0.80 | text |
| Chile | instance of | and AS565 with helicopter of navies | 0.80 | text |
| Brazil | instance of | and AS565 with helicopter of navies | 0.80 | text |
| Indonesia | instance of | and AS565 with helicopter of navies | 0.80 | text |
| and Morocco | instance of | and AS565 with helicopter of navies | 0.80 | text |
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