If you’re travelling in a moving current, it will slightly alter the gauge reading. If you are on still water you will get a more accurate reading of your boat’s actual speed. You need to remember that the water itself has an effect on this reading. Likewise, when you slow down, the water pressure decreases. That registers on the gauge as you go faster. That means that the air pressure also increases. This is what produces the speed estimate for the boat.Īs you increase the boat’s speed, the water pressure in the tube increases. To put it simply, the speed of the water entering the pitot tube is compared to the air pressure.
This in turn is able to estimate the boat’s speed. The change in air pressure is measured by a gauge at the end of the tube on your dashboard. The water entering the tube forces air up the tube as well. The second hole measures the water pressure. The speed of the water entering this hole is measured. As you travel in the boat, water enters the tube through one hole. The tube goes through the boat’s hull and down below into the water. A pitot tube speedometer relies on tubes under the boat to help gauge speed. How Does a Boat Speedometer Work – Manual or Pitot Tube VersionĪ manual boat speedometer relies on something called a pitot tube. So when you ask how does a speedometer work on a boat, there is more than one answer. An electromagnetic speed sensor is also an option. A traditional, manual pitot tube speedometer and a GPS speedometer are the most common. There are actually several different ways that a boat speedometer works these days. That’s if it’s a more traditional boat speedometer. Instead, your boat speedometer measures the speed of water travelling beneath it.
Since a boat does not have wheels, it can’t measure how fast they’re moving. But it’s not exactly the same principles behind it. In some ways a boat speedometer works the same as a car speedometer. We may earn comission from links on this page, but we have confidence in all recommended products.īoat speedometers can get a little confusing.
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