Why GPS Speed Jumps or Shows Zero
GPS speed can sometimes jump, freeze, or show zero even while you are moving. Most of the time, the cause is signal quality or how the browser receives location updates.
Weak or blocked GPS signal
Buildings, tunnels, roofs, trees, and indoor use can block or reflect satellite signals. The browser may then receive delayed or noisy positions.
Low update frequency
Some devices send location updates slowly to save battery. If updates are far apart, speed may feel delayed.
Very low speeds
At walking pace or when stopped, small GPS position noise can make speed appear to jump or return to zero.
How to improve it
Move outdoors or near a window, disable aggressive battery saving, keep the phone steady, and wait a few seconds before trusting the first reading.
Test signal quality
Common questions
Short answers for this guide.
Why does speed show zero while moving?
The browser may not have a fresh reliable GPS fix yet, or the signal may be blocked.
Why does speed jump up and down?
Small GPS position errors can become visible as speed changes, especially with weak signal.
Can zigmaty fix bad GPS signal?
It can smooth and display readings, but it cannot create a strong GPS signal when the device cannot receive one.