Disconnect the beeper from the devices you don't care about. For those you do if they're too loud put a peice of tape across the opening n the beeper, it will muffle it to a level that you can still hear but it's not as ear piercing. Just think twice abotu disconnecting things like your depth finder beeper. If you set depth to alert you when you get shallow you'll be pissed at yourself about disconnecting that when you're replacing your prop, shaft, strut and rudder if you didn't hear the warning beeps.
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