Name the system which enables us to locate underwater objects by transmitting ultrasonic waves and detecting the reflecting impulse.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the name of a system that helps in locating underwater objects using ultrasonic waves.

2. **Identifying the System**: The system that is used for this purpose is called "sonar".

3. **Explaining Sonar**: Sonar stands for "Sound Navigation and Ranging". It is a technique that uses sound propagation (ultrasonic waves) to navigate, communicate with, or detect objects on or under the surface of the water.

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