I have a 2014 Harris Flotebote Sunliner. Today, while on the lake, I noticed a blinking symbol in the upper left of the engine hour guage. It appeared to be two small squares on top of each other. I checked the owner manual and found no reference to this. Does anyone know what this blinking symbol means. I'm wondering if this is some sort of alert/warning that I need to be aware of and pay attention to. Thanks.