CODEWITHSUNDEEP
iphoneobjective-cgps
hara
hara

Reputation: 23

iphone gps accuracy, can it trigger an event based on location?

I have an issue that i am having trouble to solve. We are about to develop an iphone locative application that would take you around the city with audio that would be played based on the location. I was wondering, do you know how accurate the iphone GPS will be? In terms of actual distance. I am reading 250 m on line but it looks a lot. Plus the gps in the iphone finds my location more precisley than 250 m. I know it is a generic question, but mabe you guys can give me a feedback about it, i am quite desperate and exausted. what we would live to do is, every 70-80 m, put a pin on a map with an audio file, when the user crossed the pin it would trigger an event that is the audio file. I just would love to know how accurate the gps could be so that i can start designing the experience. Thanks a lot

Upvotes: 1

Views: 1509

Answers (3)

larsacus
larsacus

Reputation: 7346

I've seen iPhone's GPS as accurate as 3m (at least that's what it said on my device when testing).

There is also a new API since iOS 4.0 that you might be interested in that will enable you to set a region for the device to monitor and it will automatically generate a callback when the user crosses the virtual fenceline depending on how accurate you need that to be. This is particularly useful when the app is sent to the background since you can simply monitor the user's location using CLLocation when the app is in the foreground:

- (void)startMonitoringForRegion:(CLRegion *)region desiredAccuracy:(CLLocationAccuracy)accuracy

Upvotes: 2

user740858
user740858

Reputation:

The accuracy is anywhere from 5-25m.

Upvotes: 0

HeikoG
HeikoG

Reputation: 1813

You can get up to 5 meters accuracy. Within the core location framework there is a property - horizontalAccurracy - that you can read at runtime to get the accuracy for a given moment

Upvotes: 0

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