### Question
How does INLAND NAVIGATIONAL RULES define prolonged blast?


### Answer
Under *33 U.S.C. § 2032*, **prolonged blast** is defined as:

> a blast of from 4 to 6 seconds’ duration

#### Citation:
  - *33 U.S.C. § 2032*
  - Heading: **CHAPTER 34-INLAND NAVIGATIONAL RULES > SUBCHAPTER I-RULES > Part D-Sound and Light Signals**

