What is the accuracy of the speed reading and the response time from gps?

Question

satellite navigation

Greetings.
The speedometer broke down, there is no place to fix it, the path is long and runs through previously uncharted territory, so I would like to follow the rules
=
) km / h will suit) and how quickly they are updated (for example, once every 5 seconds)? At least approximately, can anyone compare with real testimony.
Or does it all depend on the gps module itself in the phone?
Thanks to.

Answer 1

We compared the readings of the GPS receiver on the phone, tablet and car speedometer. The GPS readings on both devices were always 5...7 km/h less than the speedometer readings. In both devices, GPS readings are updated once a second.
By the way, pay attention to your smartphone, on mine there is such a moment - it showed GPS data about 5 seconds later.
And one more thing: the clearer the sky above the receiver and the fewer tall buildings / trees nearby, the more accurate the readings of the receiver, and if you are in a car, then it is better to put the device under the windshield, because. there is the best reception in the car.

Answer 2

depends on weather
satellite receiver

Answer 3

depending on measurement conditions, etc.
you can trust, but with reservations
, deliver "Arrow" to Android for notifications of ambushes, etc.

Answer 4

If the receiver is good, which makes 10 polls per second, then the accuracy is + -5-7 km / h, depending on the number of satellites.