These units have very large displays and the put off a lot of heat. They have either one or two internal fans, depending on the display size and the units' generation. These fans can be heard when your boat motor is not running.

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CampingEureka! | Jetboil
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FishingMinn Kota | Humminbird | Cannon
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DivingSCUBAPRO
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WatercraftOld Town | Ocean Kayak
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