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Old 08-02-2009, 04:35   #1
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Anchor alarm

Is it possible to fit an extension speaker or buzzer to a Northstar chartplotter so as to hear whilst sleeping belowMy unit is the 10inch chartplotter with radar and sonar.I have lost 50% hearing [work related] so require something pretty loud.Would it be easier to fit seperate gps above bunk thanks Steve
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Old 08-02-2009, 05:32   #2
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Steve, Radio Shack makes a Mini Audio Amplifier for $14.99 that would do the trick. It needs a 9 V battery but a good tech could build you a resistor-9V Zenner diode power supply that would wire into your 12 V ship's battery and only draw a few ma of current. You could use a microphone or wire it to the chart plotter speaker. How is that for cheap and easy?
Jerry and Denver
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alarm, anchor

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