There seems to be a widespread notion among mariners that class B signals will create too much noise and clutter on displays, so it needs to be turned off. I have even seen this attitude among single handers sailing small craft.
Large carriers have great difficulty seeing small boats because they are so high off the water. At a distance, small boats do not show up against larger waves. Up close, small boats may fall in the visual shadow of the ship. On radar, a small craft may appear to be sea clutter. Class B AIS is the most effective method of avoiding the rundown of small vessels by large carriers. Please don't turn it off.