How to calculate the car speed on iPhone

Question

I want to show a car's speeds on iPhone in real time. What can I use?

Wouldn't using gps to calculate the car's speed take many seconds?

See the following question: http://stackoverflow.com/questions/582511/iphone-corelocation-how-to-get-the-most-accurate-speed — , Aug 30 '11 at 01:28
possible duplicate of [How to calculate speed of our car using iphone](http://stackoverflow.com/questions/3818902/how-to-calculate-speed-of-our-car-using-iphone) — Brad Larson, Aug 30 '11 at 21:59

score 1 · Accepted Answer · edited Nov 07 '21 at 04:07

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I have an app called Speedometer and Map. I use Core Location to figure out where the user is, how far they move every second in miles, and then I convert this number to hours, and update it constantly.

edited Nov 07 '21 at 04:07

Nimantha

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answered Aug 30 '11 at 01:27

Jack Humphries

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Yeah, I didn't have much either. Look up tutorials about it and Apple's Documentation really helped. I'll give you some source code later when I get home if I remember. – Jack Humphries Aug 30 '11 at 01:53
Thanks, I'd appreciate it if you could my answer correct. Thanks! – Jack Humphries Aug 30 '11 at 01:58
The link is: http://www.chillysky.com/Speedometer.zip, tell me when you get it so that I can take it off. Hope this helps you! – Jack Humphries Aug 30 '11 at 05:04
Hello, i can't build the speedometer program in device what is the reason? I use ios 4.1. – Everest Aug 31 '11 at 03:40
What's the problem? Make sure you switch my certificates to yours. – Jack Humphries Aug 31 '11 at 03:57
When i build the program in device Alert view shows. – Everest Aug 31 '11 at 14:02

score 1 · Answer 2 · answered Aug 30 '11 at 01:36

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If you implement a class that conforms to the CLLocationManagerDelegate protocol, and set an instance of it as the delegate of a CLLocationManager object, your object will receive -locationManager:didUpdateToLocation:fromLocation: messages after you call -[CLLocationManager startUpdatingLocation]. The CLLocation object you receive via that method has a speed property, which is the speed of the device in meters per second. The frequency of updates can be controlled via CLLocationManager's distanceFilter and desiredAccuracy properties.

answered Aug 30 '11 at 01:36

lemnar

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For location parameter what can i use? – Everest Aug 30 '11 at 01:56
Can you tell me the following step of caculating the car speed program? – Everest Aug 30 '11 at 03:02

How to calculate the car speed on iPhone

2 Answers2