What is the actual speed when Gaode Map shows 70 km/h?
2 Answers
When Gaode Map shows a speed of 70 km/h, the actual speed is typically between 70-72 km/h. Tolerance range: Generally speaking, since navigation systems measure speed through GPS signals, a certain deviation is allowed during speed measurement. This permissible deviation usually ranges from 1 to 2 km/h. Under normal circumstances, there's no need to worry about the impact of this minor deviation. Deviation is not constant: In other words, since navigation and GPS signals are transmitted wirelessly, this deviation is not in a constant state. If GPS signals are obstructed by skyscrapers or elevated roads in urban areas, the deviation may increase. In such cases, it's advisable to prioritize the speed information provided by the vehicle's speedometer. The speedometer's data comes from real-time electrical signals provided by wheel speed sensors, making it slightly more accurate.
That day I was driving using Amap, which showed a speed of 70 km/h, but I felt the actual speed might be slightly slower than 65 km/h. This is because GPS signals can sometimes drift, especially in densely built urban areas or during bad weather. It's not that the map is inaccurate, but rather that navigation software relies on satellite positioning, and data can be slightly delayed when the vehicle moves quickly, turns, or has weak signals. I suggest not getting too hung up on the numbers—just maintain a safe speed. On highways, I often compare the car's speedometer with the GPS, and the difference is usually within a few kilometers. You get used to it after a while. When driving, it's more reliable to observe the road and surrounding traffic than to fixate on the navigation numbers.
