I have a hummingbird 300tx with speed&temp.I think the speed is reading high.Does anyone know if these speed wheels are accurate after a certain speed.<br /> thanks,RLP
My boat has the 300tx wheel, a GPS, and a speedometer with a pitot tube and they all register the same speed within 2mph of each other. Amazing. I do notice that there is a difference when travelling with or against tide and current compared to the GPS reading
