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Manually sounding fog signals at the required 2 minute intervals is at best tedious. If these signals are lung powered they can well become exhausting if compliant with the volume requirements. I have found the "Storm All Weather Whistle" to produce the loudest lung powered whistle. Whistles with a pea or similar object inside them can easily fill with water and become next to useless in the rain or overboard. When operating at night it is prudent to have everyone onboard to be wearing a lifejacket equipped with a whistle and strobe. The high frequencies produced by whistles tend to be rapidly attenuated by fog, rain and snow but can readily be distinguished from lower frequency engine noise. To easily automate you boats existing horn checkout "Fogmate".
This small device can be connected to your boats horn wiring to produce the appropriate signals and even sound an SOS.