Here are some of their comments on the new gun.
The noise gun is user friendly. All functions recording sound and distance from a suspect boat, are automated. It compensates for envronmental conditions: ambient (background) noise from nearby watercraft, wind, reflective surfaces (docks, etc.) Officers only need to point the device at a target boat for a sound level recording which can be used as evidence in a court of law. Thus, problems of current enforcement, which require cooperation of the suspect boater under complex, controlled test conditions, are simplified. As the noise gun’s trigger is depressed a uni-directional microphone, sensitive to only narrow beam of sound and a laser range finder are integrated to provide a continuous reading of noise and distance to target boat.
The test runs revealed that the target boat’s bearing is important. The Elliott boat was equipped with a “captain’s choice”, an option to run the engine with or without a muffler. Unmuffled boat noise increased from about 90 decibels at closest passage to about 97 decibels as the boat was going away. The test demonstrated effectiveness of the boat’s muffler. Despite 10-15 mph ambient wind noise the device-achieved measurements over a wide range of distances with accuracies of better than 3 decibels.
Roscommon County Sheriff Francis Staley, and Antrim County Sheriff Terry Johnson each operated the noise gun which they found very workable and were able to make repeat measurements of the test boat’s noise, an essential for successful wide usage.